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Effects of zinc-bearing palygorskite on rumen fermentation in vitro
Mengjiao Chen,Yumeng Xi,Lin Zhang,Hanfang Zeng,Yeqing Li,Zhaoyu Han 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.1
Objective: The aim of the study was to investigate the effect of zinc-bearing palygorskite (Zn-Pal) on rumen fermentation by in vitro gas-production system. Methods: In trial, 90 incubators were evenly divided into five groups: control (0% Zn-Pal), treatment I (0.2% Zn-Pal), treatment II (0.4% Zn-Pal), treatment III (0.6% Zn-Pal), and treatment IV (0.8% Zn-Pal). The contents of zinc for treatments were 0, 49, 98, 147, 196 mg/kg, respectively. The main chemical composition and microstructure of Zn-Pal was investigated by X-ray diffraction. The physicochemical features were evaluated by Zeta potential analysis, cation-exchange capacity, ethylene blue absorption and specific surface area (the Brunauer–Emmett–Teller method). In vitro gas production (GP) was recorded at 3, 6, 9, 12, 18, 24, 36, 48, 60, and 72 h incubation. Incubation was stopped at 0, 6, 12, 24, 48, and 72 h and the inoculants were tested for pH, microbial protein yield (MCP), NH3-N, volatile fatty acids (VFAs), lipopolysaccharide (LPS). Results: The results showed that the GP in the treatment groups was not significantly different from the control groups (p>0.05). Compared to the control group, pH was higher at 24 h, 48 h (p<0.05), and 72 h (p<0.01) (range 6 to 7). The concentration of NH3-N in the three treatment groups was higher than in the control group at 24 h (p<0.01), meanwhile, it was lower at 48 h and 72 h (p<0.01), except in the treatment IV. The concentration of MCP in treatment I group was higher than in the control at 48 h (p<0.01). Compared with control, the LPS concentration in treatment III became lower at 12 h (p<0.05). Total VFAs in treatments were higher than in the control at 24 h, 48 h (p<0.05). Conclusion: These results suggest that the addition of Zn-Pal can improve the rumen fermentation, especially when adding 0.2% Zn-Pal.
The Development of Syntactic Complexity in IMO Assembly Resolutions from 1959 to 2019
Suo, Mengjiao,Deng, Yaochen,Jhang, Se-Eun 새한영어영문학회 2021 새한영어영문학 Vol.63 No.3
Research on syntactic complexity has become an important field in linguistics. The aim of the current study is to investigate the diachronic changes of the syntactic complexity of International Maritime Organization (IMO) Assembly Resolutions in a period of 60 years. Under a corpus-based approach, this present study analyzes 438 texts of IMO Assembly Resolutions from 1959 to 2019. Using the Tool for the Automatic Assessment of Syntactic Sophistication and Complexity, this study measures syntactic complexity of the text by three indices which include the mean of clausal dependent types, the mean of phrase types and the mean of dependents in phrase. This investigation has revealed the syntactic features to the type of clausal, phrase and dependent in phrase of IMO Assembly Resolutions. This study then further analyzed the diachronic changes of IMO Assembly Resolutions at different periods. The results may have implications for future studies on the features of assembly resolutions in the field of Maritime English and its learning and teaching as well.
Simulation of a neutron imaging detector prototype based on SiPM array readout
Tang Mengjiao,Zhang Lianjun,Tang Bin,He Gaokui,Huang Chang,Zhao Jiangbin,Liu Yang 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.9
Neutron imaging technology as a means of non-destructive detection of materials is complementary to X-ray imaging. Silicon photomultiplier (SiPM), a new type of optical readout device, has overcome some shortcomings of traditional photomultiplier tube (PMT), such as high-power consumption, large volume, high price, uneven gain response, and inability to work in strong magnetic fields. Its application in the field of neutron detection will be an irresistible general trend. In this paper, a thermal neutron imaging detector based on 6 LiF/ZnS scintillation screen and SiPM array readout was developed. The design of the detector geometry was optimized by geant4 Monte Carlo simulation software. The optimized detector was evaluated with a step wedge sample. The results show that the detector prototype with a 48 mm 48 mm sensitive area can achieve about 38% detection efficiency and 0.26 mm position resolution when using a 300 mm thick 6 LiF/ZnS scintillation screen and a 2 mm thick Bk7 optical guide coupled with SiPM array, and has good neutron imaging capability. It provides effective data support for developing high-performance imaging detectors applied to the China Spallation Neutron Source (CSNS).