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Guangxin Chen,Cong De Qiao,Jing Xu,Jin Shui Yao 한국고분자학회 2014 폴리머 Vol.38 No.4
Reduced graphene oxide(RGO) was fabricated using gelatin as a reductant, and it could be stably dispersed in gelatin solution without aggregation. A series of RGO/gelatin composite films with various RGO contents were pre-pared by a solution-casting method. The structure and thermal properties of the RGO/gelatin composite films were char-acterized by UV-vis spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM),differential scanning calorimeter (DSC) and thermal gravi-metric analysis(TGA). scanning electron microscopy(SEM), differential scanning calorimeter(DSC) and thermal gravi-meteic analysis(TGA). The addition of RGD enhances the degree of crosslinking of gelatin films and decreases the swell-ing ability of the gelatin films in water, indicating that RGD/gelatin composite films have a better wet stability than gelatin films, The glass transition temperature(Tg)of gelatin films is also increased with the incorporation of RGO. The presence of RGO silms. Since gelatin is a natural and nontoxic biomacromolecule, the RGD/ gelatin composite films are expected to have potential applications in the biomedical field.
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Shanglong Xu,Guangxin Hu,Jie Qin,Yue Yang 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.4
Four different microchannel heat sinks are designed to study the effects of structures in microchannel heat sinks for electronic chips cooling. Based on the theoretic analysis and numerical computation of flow and heat exchange characteristics, the electronic chip’s temperature and flow rate distributions are obtained. The correspondence between flow pressure drop and chip’s temperature in the four microchannel heat sinks is also studied and analyzed. Numerically analyzed results indicate that the topological structure in microchannel heat sink has a significant influence on electronic chips cooling. This study shows various thermal properties in the four microchannel heat sinks.
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Speed Sensorless Control of Bearingless Induction Motors Based on Adaptive Flux Observer
Fang Wenxin,Yang Zebin,Sun Xiaodong,Wang Guangxin,Xu Ting 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3
To realize the speed self-identifi cation of the suspension rotor in the low-cost operation control of a bearingless induction motor (BIM), a speed sensorless control strategy based on the adaptive fl ux observer is proposed. Firstly, the stability condition of the observer is analyzed by the small-signal linearization method, and the output errors of the observer in two stationary coordinate systems are transformed into the rotor magnetic fi eld rotating coordinate, and condition of the error feedback matrix satisfying the observer stability is obtained. Secondly, based on the construction of the full-order model of the controlled object, a feedback loop containing the measured object and its variable is designed, and a reduced-order speed observer is constructed to realize the speed self-identifi cation of the BIM. Finally, simulation and experimental verifi cation research are carried out on the BIM speed sensorless vector control system. Both simulation and experiment results show that the proposed speed self-identifi cation method can not only realize speed sensorless operation under no-load, speed change, an abrupt change of load eff ectively, but also make the motor has a good suspension performance.
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Jiazhong Wu,Fanghui Liu,Hui Yang,Shijing Xu,Quan Xie,Minghui Zhang,TING CHEN,Guangxin Hu,Jinben Wang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-
Low salinity effect has been in the center of attention as a cost-effective and environmentally friendlytechnique. Wettability alteration of the oil/brine/mica system appears to be the identified mechanism(s)to trigger the low salinity effect. While the effect of water chemistry and minerology on the wettability ofthe system has been extensively investigated, few studies have investigated the effect of specific functiongroups from crude oil on the system wettability, limiting the understanding of how specific functionalgroup contributes to the wettability. We thus experimentally measured the adhesion forces betweenmica surfaces and functional groups (e.g., C6H5–, CH3–, COOH–, and NH2–) in the presence of differentaqueous ionic solutions using chemical force microscopy (CFM). Moreover, to understand thecontribution of the structural force, the traditional Derjaguin–Landau–Verwey–Overbeek (DLVO) theorywas extended (denoted as EDLVO) tofit the force profiles using a Gauss model. Our results showed thatthe adhesion force between mica and functional groups in a decreasing order was –NH2> –COOH> –CH3> –C6H5. We also found that while DLVO forces strongly affected the tip-surface contact due to theinteractions among oil/brine/mica interfaces, the structural forces also played an important role in adistance of 1–20 nm due to the presence of H-bonds between COOH-terminated or NH2-terminated tipand mica surface. We therefore conclude that the structural force largely contributes to the adhesionforce due to the hydrophilicity or polarity of functional groups, and nucleophilic property (such as phenylgroup). Our results suggest that the polarity of the crude oil needs to be considered to screen a candidatereservoir for low salinity waterflooding projects.
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Libo Yu,Xixiang Tang,Shiping Wei,Yinkun Qiu,Xiashutong Xu,Guangxin Xu,Qilin Wang,Qian Yang 한국미생물학회 2019 The journal of microbiology Vol.57 No.7
A Gram-positive, aerobic, rod-shaped, spore-forming bacterium, designated YLB-03T, with peritrichous flagella was isolated from deep-sea sediment of the Yap Trench at a depth of 4435 m. The bacterium was found to be catalase-positive but oxidase-negative. Growth of this bacterium was observed at 15–50°C (optimum 37°C), pH 5–10.5 (optimum 7), 0–5% NaCl (optimum 1%, w/v) and 0.1–50 MPa (optimum 0.1 MPa). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain YLB-03T was a member of the genus Lysinibacillus. Strain YLB-03T was closely related to Lysinibacillus sinduriensis BLB-1T and Lysinibacillus chungkukjangi 2RL3-2T (98.4%), Lysinibacillus halotolerans LAM- 612T (98.0%), Lysinibacillus telephonicus KT735049T (97.5%), Lysinibacillus endophyticus C9T (97.5%), Lysinibacillus composti NCCP-36T and Lysinibacillus massiliensis 4400831T (97.3%). The ANI and the GGDC DNA-DNA hybridization estimate values between strain YLB-03T and closely related type strains were 73.7–76.3% and 34.7–38.7%, respectively. The principal fatty acids were anteiso-C15:0 and iso-C15:0. The G+C content of the chromosomal DNA was 39.6 mol%. The respiratory quinone was determined to be MK-7. The diagnostic amino acids in the cell wall peptidoglycan contained Lys-Asp (type A4α) and the cell-wall sugars were glucose and xylose. The polar lipids included diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, and an unidentified phospholipid. The combined genotypic and phenotypic data showed that strain YLB-03T represents a novel species within the genus Lysinibacillus, for which the name Lysinibacillus yapensis sp. nov. is proposed, with the type strain YLB-03T (= MCCC 1A12698T = JCM 32871T).
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