Ni Nanoparticle Anchored on MWCNT as a Novel Electrochemical Sensor for Detection of Phenol

Yajing Wang,Jiankang Wang,Zhongping Yao,Chenyu Liu,Taiping Xie,Qihuang Deng,Zhaohua Jiang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.11

Increasing active sites and enhancing electric conductivity are critical factors to improve sensing performance toward phenol. Herein, Ni nanoparticle was successfully anchored on acidified multiwalled carbon nanotube (a-MWCNT) surface by electroless plating technique to avoid Ni nanoparticle agglomeration and guarantee high conductivity. The crystal structure, phase composition and surface morphology were characterized by XRD, SEM and TEM measurement. The as-prepared Ni/a-MWCNT nanohybrid was immobilized onto glassy carbon electrode (GCE) surface for constructing phenol sensor. The phenol sensing performance indicated that Ni/a-MWCNT/GCE exhibited an amazing detection performance with rapid response time of 4s, a relatively wide detection range from 0.01 mM to 0.48 mM, a detection limit of 7.07 μM and high sensitivity of 566.2 μAmM -1 cm -2. The superior selectivity, reproducibility, stability and applicability in real sample of Ni/a-MWCNT/GCE endowed it with potential application in discharged wastewater.

Self-adjusting strategy based on rotating injection for sensorless control of high-power PMSM drives

Xiaofan Wang,Xiaochun Fang,Zhi Wang,Zhihong Zhong,Yizhi Wang,Fei Lin,Zhongping Yang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

As a sensorless control method suitable for permanent magnet synchronous motor (PMSM) at lowspeed, rotating high-frequency injection method will face some special problems in high power applications. On the one hand, the low switching frequency limits the injected signal frequency, which is very close to the fundamental frequency. On the other hand, under heavy load conditions, the fundamental current amplitude is several hundred times of the negative sequence current. This will result in difficulty in signal extraction. In this paper, current spectrum is analyzed quantitatively based on the parameters of PMSM drive for rail vehicles, which illustrates the limitations of conventional bandpass filters. A method based on self-adjusting filter is proposed. The negative sequence current is successfully extracted, and the precise rotor position is obtained under the condition of variable speed and variable load. Based on a fullscale test platform the effectiveness of the proposed method is proved.

Identification of copy number variations using high density whole-genome single nucleotide polymorphism markers in Chinese Dongxiang spotted pigs

Chengbin Wang,Hao Chen,Xiaopeng Wang,Zhongping Wu,Weiwei Liu,Yuanmei Guo,Jun Ren,Nengshui Ding 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.12

Objective: Copy number variations (CNVs) are a major source of genetic diversity complementary to single nucleotide polymorphism (SNP) in animals. The aim of the study was to perform a comprehensive genomic analysis of CNVs based on high density whole-genome SNP markers in Chinese Dongxiang spotted pigs. Methods: We used customized Affymetrix Axiom Pig1.4M array plates containing 1.4 million SNPs and the PennCNV algorithm to identify porcine CNVs on autosomes in Chinese Dongxiang spotted pigs. Then, the next generation sequence data was used to confirm the detected CNVs. Next, functional analysis was performed for gene contents in copy number variation regions (CNVRs). In addition, we compared the identified CNVRs with those reported ones and quantitative trait loci (QTL) in the pig QTL database. Results: We identified 871 putative CNVs belonging to 2,221 CNVRs on 17 autosomes. We further discarded CNVRs that were detected only in one individual, leaving us 166 CNVRs in total. The 166 CNVRs ranged from 2.89 kb to 617.53 kb with a mean value of 93.65 kb and a genome coverage of 15.55 Mb, corresponding to 0.58% of the pig genome. A total of 119 (71.69%) of the identified CNVRs were confirmed by next generation sequence data. Moreover, functional annotation showed that these CNVRs are involved in a variety of molecular functions. More than half (56.63%) of the CNVRs (n = 94) have been reported in previous studies, while 72 CNVRs are reported for the first time. In addition, 162 (97.59%) CNVRs were found to overlap with 2,765 previously reported QTLs affecting 378 phenotypic traits. Conclusion: The findings improve the catalog of pig CNVs and provide insights and novel molecular markers for further genetic analyses of Chinese indigenous pigs.

Non-iterative Global Mesh Smoothing with Feature Preservation

Ji, Zhongping,Liu, Ligang,Wang, Guojin Society for Computational Design and Engineering 2006 International Journal of CAD/CAM Vol.6 No.1

This paper presents a novel approach for non-iterative surface smoothing with feature preservation on arbitrary meshes. Laplacian operator is performed in a global way over the mesh. The surface smoothing is formulated as a quadratic optimization problem, which is easily solved by a sparse linear system. The cost function to be optimized penalizes deviations from the global Laplacian operator while maintaining the overall shape of the original mesh. The features of the original mesh can be preserved by adding feature constraints and barycenter constraints in the system. Our approach is simple and fast, and does not cause surface shrinkage and distortion. Many experimental results are presented to show the applicability and flexibility of the approach.

An On-line Strategy based on Rolling State Prediction for Hybrid Energy Storage System of Tram

Yu Wang,Zhongping Yang,Fei Lin,Xiaochun Fang,Xingkun An,Hongda Zhou 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

This paper aims at a hybrid tram with the onboard battery-supercapacitor storage system. This paper proposes an on-line strategy based on rolling state prediction (ROS). A wavelet neural network (WNN) is used to predict the running state of the tram in a certain period of time in the future according to the historic data, and the dynamic programming (DP) algorithm is used to optimize the energy management strategy (EMS) during the period. The strategy aims to optimize the system efficiency and battery life. Compared with classical rule-based (RB) strategy, ROS greatly increases the system efficiency and lengthens lifespan of battery and achieves real-time optimization.

Preparation and properties of ceramic coating on Q235 carbon steel by plasma electrolytic oxidation

Yunlong Wang,Zhaohua Jiang,Zhongping Yao 한국물리학회 2009 Current Applied Physics Vol.9 No.5

Ceramic coating was achieved on Q235 carbon steel by PEO (plasma electrolytic oxidation, PEO) without any pretreatment in sodium aluminate system. The discharge process as well as the accompanied surface morphology evolution was analyzed. The phase and elemental composition of the coatings were also investigated. The corrosion, mechanical and tribological properties of the ceramic coating were primarily studied. It is found that the coating surface was porous and the thickness of the coating was about 120 lm. The coating mainly consisted of FeAl2O4, Fe3O4 and a little c-A12O3. The corrosion current of the coated sample was 3.082 × 10-7 A/㎠, which was decreased by two orders of magnitude compared with the uncoated one. The micro hardness of the ceramic coating was 1210 Hv, which was about three times as that of the uncoated sample. The friction coefficient of coated sample was also well improved. Investigations revealed that PEO provided a promising technique for preparation of protective ceramic coatings on steels. Ceramic coating was achieved on Q235 carbon steel by PEO (plasma electrolytic oxidation, PEO) without any pretreatment in sodium aluminate system. The discharge process as well as the accompanied surface morphology evolution was analyzed. The phase and elemental composition of the coatings were also investigated. The corrosion, mechanical and tribological properties of the ceramic coating were primarily studied. It is found that the coating surface was porous and the thickness of the coating was about 120 lm. The coating mainly consisted of FeAl2O4, Fe3O4 and a little c-A12O3. The corrosion current of the coated sample was 3.082 × 10-7 A/㎠, which was decreased by two orders of magnitude compared with the uncoated one. The micro hardness of the ceramic coating was 1210 Hv, which was about three times as that of the uncoated sample. The friction coefficient of coated sample was also well improved. Investigations revealed that PEO provided a promising technique for preparation of protective ceramic coatings on steels.

Preparation of PEO ceramic coating on Ti alloy and its high temperature oxidation resistance

Yongjun Xu,Zhongping Yao,Fangzhou Jia,Yunlong Wang,Zhaohua Jiang,Haitao Bu 한국물리학회 2010 Current Applied Physics Vol.10 No.2

Ceramic coatings were prepared in Na2SiO3–Na2CO3–NaOH system by pulsed bi-polar plasma electrolytic oxidation on Ti–6Al–4V alloy. The phase composition, structure and the elemental distribution of the coatings were studied by XRD, SEM and energy dispersive spectroscopy, respectively. The thermal shock resistance of the coated samples at 850 ℃ was evaluated by the thermal shock tests. The high temperature oxidation resistance of the coating samples at 500 ℃ was investigated. The results showed that the coating was mainly composed of rutile- and anatase TiO2, Increasing the concentration of Na2SiO3, TiO2content decreased gradually while the thickness of the coating increased. There were a large amount of micro pores and sintered particles on the surface of the coatings. Increasing concentration of Na2SiO3, the sintered particles on the surface turned large, and the Si content increased while the Ti content decreased gradually. When the concentration of Na2SiO3 was 15 g/L, the thermal shock resistance of the coatings was better than that of the coatings that prepared under other Na2SiO3 concentrations. The coating samples prepared under the optimized technique process based on the thermal shock tests improved the high temperature oxidation resistance at 500 ℃ greatly, whether considering the isothermal oxidation or the cyclic oxidation.

Evaluation of High Butanol/Acetone Ratios in ABE Fermentations with Cassava by Graph Theory and NADH Regeneration Analysis

Zhigang Li,Zhongping Shi,Xin Li,Le Li,Junping Zheng,Zhenggang Wang 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.4

Higher butanol/acetone ratio is always desirable in ABE fermentation, and this ratio is closely associated with the complicated patterns of metabolic reactions and NADH generation rate. The patterns of acetate/butyrate formation and re-assimilation in multiple closed reaction loops, as well as NADH regeneration in ABE fermentation using different substrates varies. In this study, we evaluated butanol/acetone ratio in ABE fermentations utilizing cassava and corn based media by graph theory and NADH regeneration analysis. The theoretical calculations and experimental data revealed that a lower metabolic strength in butyrate loop and enhanced NADH generation rate were responsible for the achievement of higher butanol/acetone ratio when fermenting cassava based substrate. In traditional fermentations and extractive fermentations with oleyl alcohol/bio-diesel as the extractants when using cassava based substrate, butanol/acetone ratios reached 2.24, 2.84,and 2.19 with the increasing increments of 14.9, 61.4, and 6.8% respectively, while butanol productivities stayed at comparably high levels as compared with those of the fermentations when cultivating on corn based substrate.

Shear Behavior of Marlstone Containing Parallel Fissure under Normal Unloading

Zhiming Yin,Xinrong Liu,Zhongping Yang,Yanlei Wang 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.4

Shear tests under normal unloading were carried out to further study the shear mechanical behavior of marlstone containing parallel fissures. The results reveal that the failure on the rock bridge is tensile failure except for the limited extrusion failure at the tip of the prefabricated fissure. The failure on both sides is generally tensile-shear mixed failure, in which the tensile failure is mainly concentrated in the middle of both sides. In general, it can be summarized as a tensile-shear failure mode of STS-T-STS (S means shear failure, T means tension failure). The failure normal stress of the specimens gradually increases and then decreases with the increase of the fissure inclination, increases with an increase in the initial normal/shear stress, and decreases with the increase of the unloading rate. Strong dilation occurred in the shear process of the specimens, which shows obvious arch effect. The variation law of dilatancy deformation and horizontal deformation in the stage of normal stress unloading is just opposite to that of the failure normal stress. The increasing effect of high shear stress on shear deformation is greater than that of dilatancy deformation, while the inhibiting effect of high normal stress on dilatancy deformation is greater than that of the shear deformation.

Efficacy/Safety of Ombitasvir/Paritaprevir/Ritonavir and Dasabuvir with Ribavirin in Asian Patients with Genotype 1b HCV-Infected, Compensated Cirrhosis: ONYX-II SVR 24 Results

( Lai Wei ),( Gui-qiang Wang ),( Yan Luo ),( Chi-jen Chu ),( Seung Woon Paik ),( Jinlin Hou ),( Jun Cheng ),( Qing Xie ),( Zhongping Duan ),( Jia-horng Kao ),( Linda Fredrick ),( Bo Fu ),( Niloufar Mo 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1

Aims: ONYX-II is a phase 3, open-label study of 3-DAA regimen of OBV/PTV/r and DSV with RBV in treatment-naive and experienced patients with genotype 1b HCV infection and compensated cirrhosis in China, South Korea and Taiwan. SVR12 rate was 100% and the favourable safety profile was shown. The present analysis reports efficacy( SVR24) and safety results. Methods: Patients with chronic GT1b HCV infection and compensated cirrhosis received OBV/PTV/r + DSV + RBV for 12 weeks and will be followed for 48 weeks post-treatment. Efficacy was assessed by SVR12 and SVR24. Safety was assessed as the percentage of patients wi th treatment-emergent adverse events (TEAEs) and laboratory evaluation. Results: Total of 104 patients with chronic GT1b HCV infection (62% female, 100% Asian, 58% treatment-experienced) were enrolled from China (n=63), South Korea (n=21) and Taiwan (n=20). All patients received at least one dose of study drugs. The SVR24 rate was 100% (concordant with SVR12), with no patient relapsing between post-treatment week 12 and 24. Most TEAEs were mild in severity. The most common TEAEs (≥10%) were increased blood bilirubin levels (25%), pruritus (15%), anaemia (14%), asthenia (12%), bilirubin conjugated increased (12%), blood bilirubin unconjugated increased (12%), dizziness (11%) and fatigue (11%). Four patients had serious AEs and all were assessed as not being related to the 3-DAA regimen (one was assessed as being possibly related to RBV). One patient discontinued treatment due to TEAEs (elevations in alanine aminotransferase [ALT], aspartate aminotransferase [AST] and blood bilirubin) after 3 weeks of dosing but achieved SVR12 and SVR24. Laboratory abnormalities ≥ grade 3 were infrequent (ALT: 3%; AST 2%; total bilirubin: 7%). No grade 3 haemoglobin decrease was reported. Conclusions: SVR24 and SVR12 rates were concordant (100%) in HCV GT1b-infected Asian patients with compensated cirrhosis. The regimen was generally well tolerated with mostly mild TEAEs reported.