Gamma radiation shielding properties of WO3/Bi2O3/waterborne polyurethane composites

Wu Zhengxin,Li Yong,Yan Qiang,Liu Guoqing,Liu Yong,Wang Guowei,He Liang 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.3

In this study, the gamma-ray shielding performance and the mechanical properties of waterborne polyurethane (WPU) composites embedded with tungsten trioxide (WO3) and bismuth trioxide (Bi2O3) were investigated. The results indicated that the shielding properties of the composites against gamma rays increased with WO3/Bi2O3 loading and that nanocomposites were better able to attenuate gamma rays than microcomposites. The mass ratio of WO3 and Bi2O3 in the composite played an important role in attenuating low-energy gamma rays. With the increment of Bi2O3 loading, the composite’s ability to attenuate 59.5 keV and 121.8 keV gamma rays improved, whereas higher WO3 contents enhanced the ability to attenuate 81 keV gamma ray. In terms of mechanical properties, with WO3/Bi2O3 loading increased, the tensile strength of composites frst increased and then decreased, and the elongation at break steadily decreased. Gamma irradiation also improved the mechanical properties of the WPU composites, as indicated by the increase in tensile strength as the irradiation dose increased from 50 to 200 kGy.

Whole-genome sequence association study identifies cyclin dependent kinase 8 as a key gene for the number of mummified piglets

Wu Pingxian,Chen Dejuan,Wang Kai,Wang Shujie,Liu Yihui,Jiang Anan,Xiao Weihang,Jiang Yanzhi,Zhu Li,Xu Xu,Qiu Xiaotian,Li Xuewei,Tang Guoqing 아세아·태평양축산학회 2023 Animal Bioscience Vol.36 No.1

Objective: Pigs, an ideal biomedical model for human diseases, suffer from about 50% early embryonic and fetal death, a major cause of fertility loss worldwide. However, identifying the causal variant remains a huge challenge. This study aimed to detect single nucleotide polymorphisms (SNPs) and candidate genes for the number of mummified (NM) piglets using the imputed whole-genome sequence (WGS) and validate the potential candidate genes. Methods: The imputed WGS was introduced from genotyping-by-sequencing (GBS) using a multi-breed reference population. We performed genome-wide association studies (GWAS) for NM piglets at birth from a Landrace pig populatiGWAS peak located on SSC11: 0.10 to 7.11 Mbp (Top SNP, SSC11:1,889,658 bp; p = 9.98E-13) was identified in cyclin dependent kinase on. A total of 300 Landrace pigs were genotyped by GBS. The whole-genome variants were imputed, and 4,252,858 SNPs were obtained. Various molecular experiments were conducted to determine how the genes affected NM in pigs. Results: A strong GWAS peak located on SSC11: 0.10 to 7.11 Mbp (Top SNP, SSC11:1,889,658 bp; p = 9.98E-13) was identified in cyclin dependent kinase 8 (CDK8) gene, which plays a crucial role in embryonic retardation and lethality. Based on the molecular experiments, we found that Y-box binding protein 1 (YBX1) was a crucial transcription factor for CDK8, which mediated the effect of CDK8 in the proliferation of porcine ovarian granulosa cells via transforming growth factor beta/small mother against decapentaplegic signaling pathway, and, as a consequence, affected embryo quality, indicating that this pathway may be contributing to mummified fetal in pigs. Conclusion: A powerful imputation-based association study was performed to identify genes associated with NM in pigs. CDK8 was suggested as a functional gene for the proliferation of porcine ovarian granulosa cells, but further studies are required to determine causative mutations and the effect of loci on NM in pigs.

Multi-granular Angle Description for Plant Leaf Classification and Retrieval Based on Quotient Space

Guoqing Xu,Ran Wu,Qi Wang 한국정보처리학회 2020 Journal of information processing systems Vol.16 No.3

Plant leaf classification is a significant application of image processing techniques in modern agriculture. Inthis paper, a multi-granular angle description method is proposed for plant leaf classification and retrieval. Theproposed method can describe leaf information from coarse to fine using multi-granular angle features. In theproposed method, each leaf contour is partitioned first with equal arc length under different granularities. Andthen three kinds of angle features are derived under each granular partition of leaf contour: angle value, anglehistogram, and angular ternary pattern. These multi-granular angle features can capture both local and globeinformation of the leaf contour, and make a comprehensive description. In leaf matching stage, the simple cityblock metric is used to compute the dissimilarity of each pair of leaf under different granularities. And thematching scores at different granularities are fused based on quotient space theory to obtain the final leafsimilarity measurement. Plant leaf classification and retrieval experiments are conducted on two challengingleaf image databases: Swedish leaf database and Flavia leaf database. The experimental results and thecomparison with state-of-the-art methods indicate that proposed method has promising classification andretrieval performance.

Hyperthermic intraperitoneal chemotherapy in advanced ovarian cancer

Tao Wu,Xi-Xia Zhao,Guoqing Wang 대한부인종양학회 2018 Journal of Gynecologic Oncology Vol.29 No.4

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Frequency Characteristic and Impedance Analysis on Three-Phase Grid-Connected Inverters Based on DDSRF-PLL

Xiangqiang Wu,Tong Huang,Xin Chen,Haibing Hu,Guoqing He 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

Decoupled double synchronous reference frame phase locked loop (DDSRF-PLL) can effectively eliminate negative-sequence fundamental frequency component, which means the PLL control loop will have an effect on the frequency characteristics and stability of gridconnected inverters. Based on the three-phase LCL-type grid-connected inverter, the positive- and negative-sequence output impedance model of the grid-connected inverter and the frequency characteristics of DDSRF-PLL were firstly derived. Meanwhile, the regulator parameters of DDSRFPLL were designed and its effect on impedance stability of inverter was analyzed. Then, the frequency characteristics of DDSRF-PLL and the output impedance model of the grid-connected inverter were verified by the simulation and experimental results. Finally, the stability of the gridconnected with different PLL bandwidths was analyzed and verified by experimental results.

Antiproliferative Activities of Parthenolide and Golden Feverfew Extract Against Three Human Cancer Cell Lines

Changqing Wu,Feng Chen,James W. Rushing,Xi Wang,김현진,George Huang,Vivian Haley-Zitlin,Guoqing He 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.1

The medicinal herb feverfew [Tanacetum parthenium (L.) Schultz-Bip.] has long been used as a folk remedyfor the treatment of migraine and arthritis. Parthenolide, a sesquiterpene lactone, is considered to be the primary bioactivecompound in feverfew having anti-migraine, anti-tumor, and anti-inflammatory properties. In this study we determined, throughin vitrobioassays, the inhibitory activity of parthenolide and golden feverfew extract against two human breast cancer celllines (Hs605T and MCF-7) and one human cervical cancer cell line (SiHa). Feverfew ethanolic extract inhibited the growthof all three types of cancer cells with a half-effective concentration (EC50) of 1.5 mg/mL against Hs605T, 2.1 mg/mL againstMCF-7, and 0.6 mg/mL against SiHa. Among the tested constituents of feverfew (i.e., parthenolide, camphor, luteolin, andapigenin), parthenolide showed the highest inhibitory effect with an EC50 against Hs605T, MCF-7, and SiHa of 2.6 .g/mL,2.8 .g/mL, and 2.7 .g/mL, respectively. Interactions between parthenolide and flavonoids (apigenin and luteolin) in fever-few extract also were investigated to elucidate possible synergistic or antagonistic effects. The results revealed that apigeninand luteolin might have moderate to weak synergistic effects with parthenolide on the inhibition of cancer cell growth ofHs605T, MCF-7, and SiHa.

Research on Immunity to Electric Impulsive Interference of ZPW-2000 Track Circuit in Station

Xiaochun Wu,Guoqing Li 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.1

Enhancement mechanism of SO2 removal with calcium hydroxide in the presence of NO2

Jihui Gao,Guoqing Chen,Xiaolin Fu,Yijun Yin,Shaohua Wu,Yukun Qin 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.2

The enhancement mechanism of SO2 removal by the presence of NO2 under low temperature and humid conditions was studied in a fixed bed reactor system. The presence of NO2 in the flue gas can enhance SO2 removal. The interaction between SO2 and NO2 in gas phase could not explain the effect of NO2 on SO2 removal under lowtemperature and humid conditions. When Ca(NO3)2 and Ca(NO2)2 as additive were added on the surface of sorbent,the desulfurization activity of sorbent decreased. However, the sorbent pretreated by NO2 for a moment has higher SO2removal. The oxidization of SO32− to SO42− and the evolution of sorbent surface structure in the presence of NO2 can explain the enhancement of SO2 removal by the presence of NO2. HSO3− and SO3− reacted with NO2 to form sulfate,which can accelerate the hydrolysis of SO2. The reaction between NO2 and Ca(OH)2 can make the unreacted sorbet under the SO2 removal product exposed to the reactant gas.

Apolipoprotein H: a novel regulator of fat accumulation in duck myoblasts

Ziyi Pan,Guoqing Du,Guoyu Li,Dongsheng Wu,Xingyong Chen,Zhaoyu Geng 한국축산학회 2022 한국축산학회지 Vol.64 No.6

Apolipoprotein H (APOH) primarily engages in fat metabolism and inflammatory disease response. This study aimed to investigate the effects of APOH on fat synthesis in duck myoblasts (CS2s) by APOH overexpression and knockdown. CS2s overexpressing APOH showed enhanced triglyceride (TG) and cholesterol (CHOL) contents and elevated the mRNA and protein expression of AKT serine/threonine kinase 1 (AKT1), ELOVL fatty acid elongase 6 (ELOVL6), and acetyl-CoA carboxylase 1 (ACC1) while reducing the expression of protein kinase AMP-activated catalytic subunit alpha 1 (AMPK), peroxisome proliferator activated receptor gamma (PPARG), acyl-CoA synthetase long chain family member 1 (ACSL1), and lipoprotein lipase (LPL). The results showed that knockdown of APOH in CS2s reduced the content of TG and CHOL, reduced the expression of ACC1, ELOVL6, and AKT1, and increased the gene and protein expression of PPARG, LPL, ACSL1, and AMPK. Our results showed that APOH affected lipid deposition in myoblasts by inhibiting fatty acid beta-oxidation and promoting fatty acid biosynthesis by regulating the expression of the AKT/AMPK pathway. This study provides the necessary basic information for the role of APOH in fat accumulation in duck myoblasts for the first time and enables researchers to study the genes related to fat deposition in meat ducks in a new direction.

An Innovative Rotor Position Detection at Stand-Still and Low Speed with Carrier Phase-Shifted PWM Method

Kewang Qu,Guoqing Xu,차석원,Yanhui Zhang,Wei Feng,Junci Cao,Weili Li,Yihuang Zhang,Zhigang Wu 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.9

An innovative permanent magnet synchronous motor rotor position detection method using d-q reference-frames derived from PWM inverter switching is presented based on carrier phase-shift PWM method. It also gives the development the polarity identification at standstill for permanent magnet synchronies motor in the rotary frame with position detected of the neutral voltage. The new technique detects the motor position from simple measurements of the neutral point voltage of the motor influenced by the variation of inductances with respect to rotor position. The transfer is derived with constant element and 2nd harmonic element of selfinductance and mutual-inductance between three phase inductances and the inductance of d-axis and q-axis. Theoretical studies are carried out and verified using experiment results with variation rotor position over one electrical cycle at standstill. Rotor position estimation from stator inductance variation with rotor position is effective in zero speed and low speed.