http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Sorption kinetics of sulphate ions on quaternary ammonium-modified rice straw
Wei Cao,Zhi Dang,Bao-Ling Yuan,Chun-Hua Shen,Jin Kan,Xiu-Ling Xue 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Batch sorption experiments with variable concentration of sulphate and temperature were conducted to investigate sorption kinetics of sulphate ions on quaternary ammonium-modified rice straw (QMRS). Kinetic data were discussed with pseudo first- and second-order rate equations and diffusion models. The results showed the sorption equilibrium time is about 20 min and the activated energy Ea is 19.3 kJ/mol. Increase of temperature and initial sulphate concentration favored sorption process. The sorption kinetics followed pseudo second-order rate equation, and the overall rate was determined by film diffusion. Additionally, characterization by 13C NMR and EDS confirmed the presence of quaternary ammonium groups in QMRS.
Lycorine: A Potential Broad-Spectrum Agent Against Crop Pathogenic Fungi
( Jin Wen Shen ),( Yuan Ruan ),( Wei Ren ),( Bing Ji Ma ),( Xiao Long Wang ),( Chun Feng Zheng ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.3
A screening test showed that lycorine exhibited significant antifungal activity against 24 pathogenic crop fungi at concentrations of 500μg/ml and 100μg/ml, respectively. Fusarium graminearum was selected for antifungal mechanism studies by observing its mycelial morphology and investigating the variations in its conductivity. In addition, the substance absorption and metabolism of F. graminearum were explored. The mechanism was revealed as being one by which lycorine destroyed the cellular membrane and further influenced substance absorption and cell metabolism.
Antimonene prepared by laser irradiation applied for nonlinear optical limiting
Weili Shen,Jinning Hu,Teng Ma,Jiaxin Wang,Yi Wei,Yuanzhou Zhang,Jinqiang Wu,Jun Chen 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.6
Antimonene, a novel two-dimension (2D) Group-VA material, shows excellent electrical and optical properties. In this work,antimonene nanosheets or nanoparticles were obtained by laser irradiating antimony powder in isopropanol solution anddiff erent morphology of antimonene were obtained by adjusting diff erent laser irradiation parameters, including irradiationtime and irradiation energy. The nonlinear absorption properties of antimonene with diff erent morphologies under 532 nmnanosecond laser were studied by Z-scan technology. It was found that the reverse-saturation absorption ability was thestrongest when the morphology of the sample was nanosheets, which was very suitable for optical limiting. In addition, dueto the limitation of the application of the sample in the form of solution, we added it into organosilicon, and obtained thesolid antimonene-organosilicon composite with optical limiting function. The results showed that antimonene nanosheetswith best optical limiting ability can be prepared by adjusting the laser irradiation parameters, and the products are successfullyadded into solid matrix to enhance its practicability in protecting people’s eyes and optical equipment from damagecaused by high power laser.
Naikun Shen,Qingyan Wang,Yan Qin,Jin Zhu,Qixi Zhu,Huizhi Mi,Yutuo Wei,Ribo Huang 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.6
A method combining a Plackett-Burman design(PBD), the steepest ascent method (SA), and a Box-Behnken design (BBD) was developed to optimize succinicacid production from cane molasses by Actinobacillussuccinogenes GXAS137. The important parameters were(g/L): total sugars of cane molasses (85 g/L), yeast extract(8.84 g/L), and MgCO3 (63.1 g/L). Verification experimentsindicated that the maximal succinic acid productionreached 57.43±0.86 g/L, which agreed with the predictedvalue (57.12 g/L). In addition, batch and fed-batchfermentations were carried out in a 1.3 L stirred bioreactor. Compared with a batch fermentation that produced 57.96g/L of succinic acid at 60 h, a fed-batch fermentation,performed to minimize the inhibition effect of the substrate,produced 64.34 g/L of succinic acid at 60 h. The combinedmethod is powerful for selection of optimized conditionsfor succinic acid production from cane molasses.
Application of cost-sensitive LSTM in water level prediction for nuclear reactor pressurizer
Zhang Jin,Wang Xiaolong,Zhao Cheng,Bai Wei,Shen Jun,Li Yang,Pan Zhisong,Duan Yexin 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.7
Applying an accurate parametric prediction model to identify abnormal or false pressurizer water levels (PWLs) is critical to the safe operation of marine pressurized water reactors (PWRs). Recently, deeplearning-based models have proved to be a powerful feature extractor to perform high-accuracy prediction. However, the effectiveness of models still suffers from two issues in PWL prediction: the correlations shifting over time between PWL and other feature parameters, and the example imbalance between fluctuation examples (minority) and stable examples (majority). To address these problems, we propose a cost-sensitive mechanism to facilitate the model to learn the feature representation of later examples and fluctuation examples. By weighting the standard mean square error loss with a costsensitive factor, we develop a Cost-Sensitive Long Short-Term Memory (CSLSTM) model to predict the PWL of PWRs. The overall performance of the CSLSTM is assessed by a variety of evaluation metrics with the experimental data collected from a marine PWR simulator. The comparisons with the Long ShortTerm Memory (LSTM) model and the Support Vector Regression (SVR) model demonstrate the effectiveness of the CSLSTM
Lu Yanyang,Wei Ying,Shen Xiaoqin,Tong Yixi,Lu Jin,Zhang Yahui,Ma Yun,Zhang Rong 한국유전학회 2023 Genes & Genomics Vol.45 No.11
Background Endometrial carcinoma (EC) is the most prevalent gynecological cancer. Transcription factor (TF) regulates a large number of downstream target genes and is a key determinant of all physiological activities, including cell proliferation, differentiation, apoptosis, and cell cycle. The transcription factor E2F1 shows prominent roles in EC. BMI1 is a member of Polycomb suppressor Complex 1 (PRC1) and has been shown to be associated with EC invasiveness. It is currently unclear whether E2F1 can participate in the proliferation, migration, and invasion processes of EC cells by regulating BMI1 transcription. Objective We investigated whether E2F1 could participate in the proliferation, migration, and invasion processes of EC cells by regulating BMI1 transcription, in order to further clarify the pathogenesis and etiology of EC, and provide reference for identifying potential therapeutic targets and developing effective prevention and treatment strategies for this disease. Methods Human endometrial epithelial cells (hEECs) and human EC cell lines were selected. E2F1 expression was assessed by Western blot. E2F1 was silenced in AN3CA or overexpressed in HEC-1 by transfections, or E2F1 was silenced and BMI1 was overexpressed in AN3CA by cotransfection. Cell proliferation, migration, and invasion were detected by MTT, wound healing, and Transwell assays. The binding sites between E2F1 and BMI1 promoters were predicted through JASPAR website, and the targeted binding was verified by dual-luciferase report and ChIP assays. Results E2F1 was up-regulated in human EC cell lines, with its expression highest in AN3CA, and lowest in HEC-1. AN3CA invasion, migration, and proliferation were repressed by E2F1 knockdown, while those of HEC-1 cells were promoted by E2F1 overexpression. E2F1 overexpression increased the activity of wild type BMI1 reporter vector promoter, while this promotion was weakened after mutation of the predicted binding site in the BMI1 promoter. In the precipitated E2F1, BMI1 promoter site level was higher than that of IgG immunoprecipitant. BMI1 silencing suppressed AN3CA cell growth. BMI1 overexpression partially abrogated E2F1 silencing-inhibited EC cell growth. Conclusion E2F1 promoted EC cell proliferation, invasion, and migration by promoting the transcription of BMI1.
Modification of Fe/Cu Multilayers under 2-MeV Xe20+ Irradiation
Kong-Fang Wei,Zhi-Guang Wang,Jie Gou,Yan-Bin Sheng,Gen-Ming Jin,Hang Zang,Cun-Feng Yao,Yi-Zhun Ma,Tie-Long Shen 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.6
Multilayers with a structure of Si/[Fe(10 nm)/Cu(10 nm)]5 were deposited on Si(100) substrates and then irradiated at room temperature by using 2-MeV Xe20+. The modifications of the multilayers were characterized using a depth profile analysis of the Auger electron spectroscopy (AES) data and the evolution of crystallite structures of the multilayers were analyzed by using X-ray diffraction (XRD). The AES depth profiles indicated that de-mixing of the Fe and the Cu layers was observed at low ion fluences, but inter-mixing of the Fe and the Cu layers was found at high ion fluences and destroyed the layered structure of the multilayers. The obtained XRD patterns showed that, after irradiation by 2-MeV Xe20+ at 2 × 1016 ions/cm2, the peaks of the multilayers related to a Cu-based fcc solid solution and an Fe-based bcc solid solution phase became visible, which implied that the inter-mixing at the Fe/Cu interface resulted in the formation of new phases. A possible mechanism of modification in the Fe/Cu multilayers induced by ion irradiation is briefly discussed. Multilayers with a structure of Si/[Fe(10 nm)/Cu(10 nm)]5 were deposited on Si(100) substrates and then irradiated at room temperature by using 2-MeV Xe20+. The modifications of the multilayers were characterized using a depth profile analysis of the Auger electron spectroscopy (AES) data and the evolution of crystallite structures of the multilayers were analyzed by using X-ray diffraction (XRD). The AES depth profiles indicated that de-mixing of the Fe and the Cu layers was observed at low ion fluences, but inter-mixing of the Fe and the Cu layers was found at high ion fluences and destroyed the layered structure of the multilayers. The obtained XRD patterns showed that, after irradiation by 2-MeV Xe20+ at 2 × 1016 ions/cm2, the peaks of the multilayers related to a Cu-based fcc solid solution and an Fe-based bcc solid solution phase became visible, which implied that the inter-mixing at the Fe/Cu interface resulted in the formation of new phases. A possible mechanism of modification in the Fe/Cu multilayers induced by ion irradiation is briefly discussed.