The Numerical Simulation Analysis of Flow Field in Level Control Valve of Water Storage Tank

Yaping Wang,Lei Gao,Jianghua Ge,Han Gao,Jing Zhang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10

Level control valve of water storage tank is installed in the outlet of tank, which control the water level of water storage tank by adjusting the water emissions, which make great significance for the safe operation of the super (super) criticality thermal power unit boiler . Complete the simulation analysis of internal flow field by the method of numerical simulation ,in order to achieve structure improvements of level control valve of water storage tank, that make level control valve of water storage tank better meet the work requirements. Establish flow channel model and mesh models of level control valve of water storage tank in various stages of the open process. Make three dimensional viscous numerical simulation of the internal complex flow field by the computational fluid dynamics software of ANSYS CFX. The error between the simulation values of the flow coefficient and the theoretical values , trial values is less than 5% ,which verifies the correctness of the simulation results . Get pressure contour , velocity streamline diagrams and outlet mass flow of level control valve of water storage tank in various stages of the open process. According to the pressure contours and velocity streamline diagrams, make detailed analysis of the flow field of level control valve of water storage tank. According to the dates of outlet mass flow, fit the flow characteristic curve of level control valve of water storage tank. Provide a theoretical basis for the structural design of level control valve of water storage tank.

Synthesis of Novel Poly(N,N-diethylacrylamide-co-acrylic acid) (P(DEA-co-AA)) Microgels as Carrier of Horseradish Peroxidase Immobilization for Pollution Treatment

Yaping Zhang,Jian Fang,Tonghuan Liu,Qiang Wang,Jihua Zhao,Weiguo Shen 한국고분자학회 2012 Macromolecular Research Vol.20 No.5

A series of temperature-sensitive N,N-diethylacrylamide-co-acrylic acid microgels were synthesized by modified surfactant-free emulsion polymerization method and characterized by Fourier transform infrared spectroscopy,turbidimetric method, scanning electron microscopy (SEM), and dynamic light scattering (DLS) measurements. The SEM images showed that the as-synthesized microgels were monodispersed as spherical particles and the average size increased from 200 to 800 nm with the mole fraction of acrylic acid (AA) increasing from 0 to 0.40. Turbidimetric analysis and DLS investigation indicated that the volume phase transition temperature and the swelling ratio of the microgels had an upward trend that was associated with the higher incorporation of AA. Furthermore,horseradish peroxidase (HRP) was successfully immobilized on the microgel with the greatest swelling ratio (the mole fraction of AA equal to 0.40) to obtain an enzyme-microgel complex for the treatment of wastewater polluted by phenolic compounds. The immobilized HRP achieved a high removal efficiency of >96% toward phenol and was more thermostable and more easily stored and reused compared with free HRP.

Folate-decorated Polysaccharide-doxorubicin Polymer: Synthesis, Characterization, and Activity in HeLa Cells

Lei Zhang,Lulu Guo,Jingna Ding,Yongming Lu,Yaping Zhang,Yan Chen 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.8

In order to develop the application of the natural polysaccharide lentinan (LNT) and decrease the side effects of doxorubicin, we successfully synthesized a novel folate-modified maleilated lentinan-doxorubicin (FA-M.LNT-DOX) polymer and used it for tumor-targeted drug delivery. The release efficiency and cytotoxicity of the prodrugs were evaluated in vitro. Although DOX release from FA-M.LNT-DOX was quite slow in a neutral buffer, it was particularly fast in an acidic solution with a pH of 5.0. Compared with DOX, FA-M.LNT-DOX showed higher cytotoxicity in HeLa cells and significantly lower cytotoxicity in normal cells. These results suggested that FA-M.LNT-DOX could be considered as a potential drug delivery candidate for folate receptor-positive cancer therapy.

Addendum: A phase II trial of cytoreductive surgery combined with niraparib maintenance in platinum- sensitive, secondary recurrent ovarian cancer: SGOG SOC-3 study

Ting-Yan Shi,Libing Xiang,Jianqing Zhu,Ji-hong Liu,Ping Zhang,Hua-ying Wang,Yanling Feng,Tao Zhu,Yingli Zhang,Aijun Yu,Wei Jiang,Xipeng Wang,Yaping Zhu,Sufang Wu,Yincheng Teng,Jiejie Zhang,Rong Jiang 대한부인종양학회 2022 Journal of Gynecologic Oncology Vol.33 No.4

Directional Water Transport in Fabrics by Varying Yarn Coordination and Texture Design

Yaping Li,Jie Fan,Shengyu Zhang,Zhaopeng Xia,Liang Wang,Yong Liu 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2

Directional water transport fabric plays a pivotal role in personal thermal management. However, it has remained a greatchallenge to reach the target only by texture design and yarn coordination. Here, we reported a trilayered woven fabric (TWF)with directional water transport performance by combining a hierarchical microporous structure and asymmetric wettability. The TWF is composed of interweaved plain weave layer (PWL), basket weave layer (BWL) and float layer (FL), whichprovides the continuous water transfer paths by the continuous warp yarns that move back and forth in the thickness directionof the fabric. The asymmetric structure of the TWF endows the fabric with excellent directional water management property,which can be tailored by the fineness and the wetting state of weft yarn in the three layers, and the groove structure on thesurface of the PWL. The resulting TWF exhibited a high directional water transport index R (435%). The mechanism for thedirectional water transport of the BWF was investigated by analyzing the capillary force, hydrostatic pressure and hydrophobicforce. Moreover, the universality of the fabric design approach was verified by two kinds of bilayered woven fabrics (BWFs)which have an analogous texture to the TWF. Therefore, the reported method for designing directional water transport fabricthrew light on developing eco-friendly water management textiles with good durability for demanding situations.

Synthesis of 4-arms hydroxy-functionalized PMMA-b-PE through combining free radical polymerization with coordination polymerization

Yaping Sheng,Qigu Huang,Haibing Huang,Mengshan Yu,Xinli Zhang,Lu Cheng,Zhi Liu,Wei Liu,Jianjun Yi,Wantai Yang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2

The copolymerization of MMA with ethylene was promoted by metallocene complex in the presence ofinitiator tetra(2,3-epoxy propoxy)silane (Is), reducing agent Zn and cocatalyst MAO, combining freeradical polymerization with coordination polymerization via sequential monomer addition strategy inone-pot to produce 4-arms hydroxy-functionalized PMMA-b-PE. The effects of polymerizationconditions such as temperature, time, ethylene pressure and Al/Ti molar ratio on the polymerizationperformance were investigated. 4-Arms hydroxy-functionalized PMMA-b-PE was obtained by solventextraction and determined by GPC, MALLS, DSC, FT-IR, WAXD and 1H(13C) NMR. The DSC result indicatedthat the 4-arms hydroxy-functionalized PMMA-b-PE had one Tg at 87.0 ℃ and one Tm at 117.0 ℃ whichattributed to Tg of PMMA segment and Tm of PE segment, respectively. The microstructure of 4-armshydroxy-functionalized PMMA-b-PE was further confirmed by WAXD, FT-IR, and 13C NMR analysis. These results demonstrated that the obtained 4-arms block copolymer consisted of PMMA segment andcrystalline PE segment.

Prediction of rolling bearing performance degradation based on sae and TCNattention models

Yaping Wang,Dekang Hou,Di Xu,Sheng Zhang,Chaonan Yang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4

A single feature cannot show the operational state of a bearing during its entire life cycle. Therefore, a rolling bearing performance deterioration prediction method based on an SAE and the TCN-attention model is proposed. The SAE method is used to fuse the timedomain indicator and the frequency-domain indicator to construct the performance degradation characteristic indicator. The evaluation indices are used to comprehensively evaluate multiple performance degradation indices, and the fused feature indices together, to filter out the features that have a good overall performance. Attention is added to the TCN model, and the output state weight of the TCN model is calculated through a scoring function to increase the important information weight and the prediction accuracy. The appropriate network structure and parameter configuration are determined, and the rolling bearing performance degradation prediction model is established. A validation is performed using publicly available datasets from the University of Cincinnati and XJTU-SY. The results show that the method is more sensitive to the critical information part of the long time series than the other models. At the same time, the average absolute error and the root mean square error are minimized, the accuracy of the rolling bearing performance degradation prediction is high, and the model has a strong robustness and generalization abilities. Additionally, the model has practical engineering value for predicting the health status of equipment.

Prevalence of Depression in Ankylosing Spondylitis: A Systematic Review and Meta-Analysis

Lijuan Zhang,Yaping Wu,Shiguang Liu,Weiyi Zhu 대한신경정신의학회 2019 PSYCHIATRY INVESTIGATION Vol.16 No.8

The aim of this study was to provide a summary estimate of depression prevalence among people with ankylosing spondylitis (AS) in comparison to those without AS. A systematic literature search was conducted using PubMed, Embase, PsycINFO, Web of Science, the Cochrane database library, China National Knowledge Infrastructure, and Wanfang Database from their inception to December 2016. The results showed that thirty-one eligible studies involving 8,106 patients were analyzed. Fifteen methods of defining depression were reported. The overall pooled prevalence of depression was 35% (95% CI, 28–43%), with high between-study heterogeneity (I2=98.8%, p<0.001). The relative risk of depression among people with AS was 1.76 (95% CI: 1.21–2.55, eight studies, n=3,006) compared with people without AS. The depression score [standardized mean difference (SMD)=0.43, 95% CI: 0.19–0.67, seven studies, n=549] was higher in AS patients than in controls. The main influence on depression prevalence was the sample size and country of origin. In conclusion, one-third of people with AS experience symptoms of depression. Depression was more prevalent in AS patients than in controls. Further research is needed to identify effective strategies for preventing and treating depression among AS patients.

An Experimental Investigation on the Stress-strain and Permeability of Chemically Grouted Sands

( Gailing Zhang ),( Yaping Wang ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

This paper present an experimental investigation on the stress-strain relationship and permeability of chemically grouted sands during failure process in a triaxial test. The influence of confining pressures, chemical grouts contents, curing time and temperature on permeability and stress-strain characteristics of chemically grouted sands were investigated in the laboratory tests. Moreover, the pore characteristics and the relationship between permeability and deformation failure are also studied by analyzing the results of mercury intrusion porosimetry (MIP) and CT test. The experiment results show that the influence of slurry content on the permeability is obvious, when the slurry content reaches a certain threshold value, the permeability reaches the minimum value. The permeability of chemical grouting sands changed greatly under different confining pressures. Different curing ages have influence on the permeability. When the curing temperature is low, the variation of the permeability is significantly affected by the temperature. When the temperature is high, the influence of the temperature on the permeability coefficient decreases. The effect of strain on permeability coefficient is much smaller than that of confining pressure, slurry content, curing time, curing temperature and other factors. The pores of chemically grouted sand are mainly superpore and macropore with few micropores. The actual case shows that the chemically grouted mass has good durability.

Genetic and phylogenetic analysis of the honey bee sacbrood virus from jiangxi isolates

Meng Yaping,Yu Xinyue,Huang Qiang,Zhang Li Zhen,Wu Xiaobo,Wang Zilong,Yan Wei Yu 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.1

The high prevalence of honeybee viral diseases poses a severe threat to the health of honeybees and causes substantial economic losses worldwide. Sacbrood virus (SBV) is a single-strand RNA virus that infects honeybees at all life stages. The infection can shorten the lifespan of adult bees and is lethal to larvae. SBV is the major cause of honeybee losses in Asia. Genetic and phylogenetic analyses of SBV isolates from different areas have been previously conducted. However, the impact of Apis mellifera Linnaeus and Apis cerana Fabricius coexistence on the infection and phylogeny of SBV remains unknown. In this study, we collected A. cerana and A. mellifera samples from commercial apiaries, only A. cerana in mountainous region. SBV prevalence was evaluated in three commercial apiaries of Jinxi, Tonggu and Nanchang and two mountainous regions of Zixi and Yifeng. In our sampling location, we found a higher SBV prevalence in the mountainous regions than in commercial apiaries. Partial structural polyprotein coding sequences were sequenced and compared with other GenBank SBV isolates. Phylogenetic tree topologies showed that SBV isolates form two major groups based on their host specificity, and isolates from same country tend to cluster together in subclades, indicating that the host and geographic region has significant effects on SBV strain specificity.