139 results on '"Xianghua Yu"'
Search Results
2. Quantitative Phase Retrieval Through Scattering Medium via Compressive Sensing
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Tong Peng, Runze Li, Junwei Min, Dan Dan, Meiling Zhou, Xianghua Yu, Chunmin Zhang, Chen Bai, and Baoli Yao
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phase retrieval ,compressive sensing ,Imaging through scattering media ,transmission matrix ,Applied optics. Photonics ,QC350-467 ,Optics. Light ,Electrical and Electronic Engineering ,Atomic and Molecular Physics, and Optics ,TA1501-1820 - Abstract
Scattering media, such as biological tissues and turbid liquids, scatter light randomly and introduce several challenges when imaging objects behind them. The transmission matrix (TM) describes the relation between the input and output of a beam transmitted through a medium, which can be used to reconstruct a target located behind a scattering medium. However, the current TM methods cannot easily retrieve the phase distribution of objects inside or behind a scattering medium. In this work, a compressive sensing (CS) method to identify the TM of a scatter contained in an imaging system was investigated. By calibrating the TM, the phase information of the object can be retrieved quantitatively. This method allows one to retrieve multilevel and dynamic phase objects behind different scatters. The influence of the calibration parameters on the reconstruction quality was investigated in detail. The proposed method, featuring noninterference measurements of the TM and exploiting a large field of view, can be used in phase imaging applications.
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- 2022
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3. Improved Thermoelectric Performance of Flexible Film Based on Polypyrrole/Silver Nanocomposites
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Mengxuan Yin, Hanwei Du, Yulan Liu, Liang Li, and Xianghua Yu
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Materials Chemistry ,Electrical and Electronic Engineering ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials - Published
- 2022
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4. Ultra‐stretchable, fast self‐healing, conductive hydrogels for writing circuits and magnetic sensors
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Duanli Wei, Jiaqing Zhu, Licheng Luo, Huabo Huang, Liang Li, and Xianghua Yu
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Polymers and Plastics ,Organic Chemistry ,Materials Chemistry - Published
- 2022
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5. Improvement of Physical Fitness Test Assessment Criteria Based on fNIRS Technology: Taking Pull-Up as an Example
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Yu Fang, Bin Gong, Na Lü, Xianghua Yu, Zheng Wang, Guodong Chen, and Hao Yang
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Brain activation ,medicine.medical_specialty ,Multidisciplinary ,business.industry ,education ,Physical fitness ,Physical health ,Experimental data ,Test (assessment) ,Physical medicine and rehabilitation ,medicine ,Pull-up ,business ,Psychology ,Event (probability theory) - Abstract
Pull-up, as an important physical fitness test event of the “National Student Physical Health Standard”, is known as a difficult physical fitness test event. To improve the assessment criteria of pull-ups, this paper uses the functional near-infrared spectroscopy (fNIRS) to monitor the changes and activation of oxyhemoglobin (HbO) signals in the brain motor cortex of people with different body mass indexes (BMIs) during the pullup assessment. Then the relationship between BMIs and evaluation criteria is discussed. After collecting and analyzing experimental data of 18 recruited college students, it is found that the number of pull-ups performed by people with different BMIs is different when they reach the peak state of brain activation. The results of the study indicate that different assessment criteria should be adopted for different BMI groups. It is suggested that the BMI should be introduced as one of the test indexes in the examination of pull-ups event in “National Student Physical Health Standard”.
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- 2021
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6. Multiple airy beams light-sheet fluorescence microscopy
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Shuangyu Gu, Xianghua Yu, Chen Bai, Junwei Min, Runze Li, Yanlong Yang, and Baoli Yao
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Materials Science (miscellaneous) ,Biophysics ,General Physics and Astronomy ,Physical and Theoretical Chemistry ,Mathematical Physics - Abstract
Light-sheet fluorescence microscopy (LSFM) is a kind of volumetric imaging methodology suited for long term living specimens at high temporal-spatial resolution. A single Airy beam (SAB) light-sheet can extend the field of view of Light-sheet fluorescence microscopy benefiting from its non-diffracting nature, but at the cost of out-of-focus background and low imaging contrast caused by side lobes illumination. Here, we propose a method to generate a sort of multiple Airy beams (MAB), which are linearly superimposed of multiple single Airy beams with different scale factors. Compared to the SAB light-sheet, the energy of the multiple Airy beams light-sheet is more concentrated on the focal plane of the detection objective, which can improve the imaging contrast and decrease the photodamage effect. Furthermore, we combined the complementary beam subtraction (CBS) strategy to increase the axial resolution, termed as multiple Airy beams-complementary beam subtraction method, which enables the axial resolution of 1.2 μm while keeping the field of view of 450 μm × 450 μm. The effectiveness of the method is demonstrated by imaging of fluorescent beads and aspergillus conidiophores.
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- 2022
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7. Synthesis and characterization of multi-responsive poly(N-isopropylacrylamide)-sodium alginate-graphene oxide composite hydrogels
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Yiqiang Zhang, Fuguo Yang, Huabo Huang, Rui Zhao, Juan Huang, Liang Li, and Xianghua Yu
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Polymers and Plastics ,Materials Chemistry ,General Chemistry ,Condensed Matter Physics - Published
- 2022
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8. Plasma hemoglobin and the risk of death in HIV/AIDS patients treated with antiretroviral therapy
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Xiangyang Chen, Huihui Li, Dehua Su, Feifei Su, Chao Zheng, Tao Wang, Fang Peng, Shuzhen Zhao, Lina Zhao, Hemei Zhang, Xianghua Yu, Jingjing Zuo, Ruoqiu Wang, Chengnan Guo, Xiang-Qing Hou, Wang Dayong, Qipeng Xie, Guangyun Mao, Zhenmiao Ye, and Jushuang Li
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Adult ,Male ,Aging ,medicine.medical_specialty ,HB ,C-index ,interaction ,HIV Infections ,Plasma hemoglobin ,Hemoglobins ,Acquired immunodeficiency syndrome (AIDS) ,Risk Factors ,HIV/AIDS associated death ,Internal medicine ,medicine ,Humans ,Risk factor ,Proportional Hazards Models ,Acquired Immunodeficiency Syndrome ,business.industry ,Hazard ratio ,Cell Biology ,medicine.disease ,Antiretroviral therapy ,Confidence interval ,Net reclassification improvement ,net discrimination ,Anti-Retroviral Agents ,Female ,Risk of death ,business ,Research Paper - Abstract
Background: Previous studies concerning the effect of plasma hemoglobin (HB) and other factors that may modify the risk of death in people living with HIV/AIDS (PLHIV) treated with antiretroviral therapy (ART) are limited. Results: Higher HB was independently linked to a lower death risk in PLHIV, with a decrease of 29% (13%, 43%) per standard deviation (SD) increment after adjusting for CD4, VL and other potential factors [hazard ratio (HR): 0.71, 95% confidence interval (CI): 0.57-0.87, P
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- 2021
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9. Freeway Traffic Control in Presence of Capacity Drop
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Simon Hu, Pengjun Zheng, Senlin Cheng, Xianghua Yu, Yibing Wang, Jingqiu Guo, Siyu Zhang, Lihui Zhang, and Heng Wei
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050210 logistics & transportation ,education.field_of_study ,Traffic flow control ,Computer science ,Mechanical Engineering ,Freeway traffic control ,Feedback control ,05 social sciences ,Population ,Optimal control ,Automotive engineering ,Computer Science Applications ,Control measure ,0502 economics and business ,Automotive Engineering ,Drop (telecommunication) ,Metering mode ,education - Abstract
Capacity drop at congested freeway bottlenecks is well known with a lot of field observations. This paper studies coordinated ramp metering (RM) and mainstream traffic flow control (MTFC) as well as their integration (RM+MTFC) for freeway traffic, with particular attention to effects of capacity drop on the performance of traffic control measures. Via mathematical analysis and comprehensive simulation studies under an optimal control framework, the work has revealed a capacity-drop-related mechanism that MTFC and ramp metering are based on to take effects, and obtained a number of important conclusions: (1) applications of any control measure (RM, MTFC, or RM+MTFC) in freeways are justified by the existence of capacity drop in field; (2) an appropriate usage of the control measures can effectively prevent the activation of potential bottlenecks on freeways and hence avoid capacity drop; (3) any control measure is beneficial for a large majority of the driver population in a freeway network if it can manage to increase the accumulated total network exit flow; (4) it is a common misconception that ramp metering would simply transfer traffic loads from the freeway mainstream to on-ramps. The work has also highlighted the strengths, weaknesses, and applicability of ramp metering and MTFC.
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- 2021
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10. 3D Imaging Restoration of Spinning-Disk Confocal Microscopy Via Deep Learning
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Tong Peng, Baoli Yao, Dan Dan, Chao Liu, Chen Bai, Xianghua Yu, and Junwei Min
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Materials science ,Pixel ,Image quality ,business.industry ,Resolution (electron density) ,3D reconstruction ,02 engineering and technology ,Iterative reconstruction ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,020210 optoelectronics & photonics ,Optics ,Confocal microscopy ,law ,Microscopy ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,business ,Image resolution - Abstract
Due to the multipoint excitation and simultaneous detection strategy applied, spinning-disk confocal microscopy (SDCM) results in an increased imaging speed compared to conventional confocal microscopy. Additionally, the super-resolution radial fluctuations (SRRF) approach can further improve the imaging resolution of SDCM in 3D imaging at the cost of imaging time due to the large amounts of data acquisition and the increased risk of photo-bleaching and photo-toxicity due to the multiple excitations. Here, we propose a deep learning-based method for 3D SDCM, where the neighboring pixels in $z$ -scanning slices are taken into account for 3D reconstruction. Consequently, high-quality imaging slices can be reconstructed directly from the SDCM stacks with a single scan. The image quality achievable with this SRRF-Deep method is comparable with the SRRF method, whereas it achieves image reconstruction about 30 times faster using 100 times fewer images. Thus, practicality of the SDCM system can be significantly improved in 3D imaging.
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- 2020
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11. Fabrication of poly(vinyl alcohol)–graphene oxide–polypyrrole composite hydrogel for elastic supercapacitors
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Huabo Huang, Duanli Wei, Xianghua Yu, Jiaqing Zhu, Luo Licheng, and Liang Li
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Supercapacitor ,Vinyl alcohol ,Materials science ,Graphene ,Mechanical Engineering ,Composite number ,Polypyrrole ,law.invention ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,law ,Self-healing hydrogels ,General Materials Science ,Composite material ,In situ polymerization ,Elasticity (economics) - Abstract
High-performance elastic supercapacitors represent a promising kind of energy storage devices that can be employed in soft robotics and wearable electronics. The development of novel functional materials as supercapacitor electrode is still tremendously challenging. In the present work, the conductive polyvinyl alcohol–graphene oxide–polypyrrole (PVA–GO–PPy) composite hydrogels are fabricated through in situ polymerization of pyrrole in the presence of PVA and GO and subsequent freeze-thawing. Owing to the unique porous layered-wrinkle network and functional component of PVA–GO–PPy composite hydrogels, the as-prepared hydrogels exhibit lightweight, elasticity, compressibility, formability and softness. Furthermore, the mechanically robust and microstructured PVA–GO–PPy composite hydrogels are used to construct an elastic symmetric solid-state supercapacitor with good electrochemical performance. The device exhibits long-term compression/recovery elasticity under 50% strain, and even the volumetric capacitance retention is still about 81% when the strain is up to 80%. The excellent compression/recovery elasticity and good mechanical integrity of the high-performance supercapacitor based on PVA–GO–PPy composite hydrogel open up new opportunities for next-generation electronic devices in the practical application.
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- 2020
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12. A Chitosan/Poly(ethylene oxide)‐Based Hybrid Polymer Composite Electrolyte Suitable for Solid‐State Lithium Metal Batteries
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Tengfei Qu, Tao Li, Xianghua Yu, Yuanxin Wan, Dongshan Zhou, Hongyan Lu, Jing Jiang, Liang Li, Xiaoqian Xu, Shun Ai, Tianyi Wang, and Shaochuan Luo
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Chitosan ,chemistry.chemical_compound ,Materials science ,chemistry ,Chemical engineering ,Polymer composites ,Oxide ,Solid-state ,Ionic conductivity ,General Chemistry ,Electrolyte ,Lithium metal ,Poly ethylene - Published
- 2020
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13. Strong alginate/reduced graphene oxide composite hydrogels with enhanced dye adsorption performance
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Xiao Daijun, Liang Li, Xiong Lijun, He Minghong, Xianghua Yu, Liu Yulan, Lai Wei, and Zhang Qiao
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Aqueous solution ,Materials science ,Polymers and Plastics ,Graphene ,Metal ions in aqueous solution ,Composite number ,Oxide ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,complex mixtures ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,Adsorption ,Chemical engineering ,chemistry ,law ,Desorption ,Self-healing hydrogels ,Materials Chemistry ,0210 nano-technology - Abstract
The alginate/reduced graphene oxide composite hydrogels with hierarchical network structures were synthesized through the hydrothermal treatment of graphene oxide and alginate in an aqueous solution followed by ionically cross-linking of metal ions. The network of reduced graphene oxide was prepared via self-assembly of graphene nanosheets in the presence of alginate during the hydrothermal process; then, the polymer network of alginate was obtained by ionically cross-linking, forming the composite hydrogel. The effect of metal ions on the physical properties of the composite hydrogels was investigated. The prepared alginate/reduced graphene oxide composite hydrogel cross-linked by Fe3+ ions showed higher compression strength and lower swelling ratio. Moreover, due to the synergetic interaction between graphene and alginate, the composite hydrogels exhibited the improved dye adsorption performance, especially for cationic dyes. Even after ten adsorption/desorption cycles, the composite hydrogels can retain more than 90% dye adsorption capacity. The results indicated that the composite hydrogel with good stability, adsorption and regeneration ability could be a promising candidate for dye removal from waste aqueous solutions.
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- 2020
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14. Promotion and Influence of Motion Capture Technology on 3D Animation Production
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Xianghua Yu
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- 2022
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15. Polypyrrole-Derived Carbon Nanotubes for Potential Application in Electrochemical Detection of Dopamine
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Yangyuchuang Wang, Wenzi Yao, Huabo Huang, Juan Huang, Liang Li, and Xianghua Yu
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General Materials Science ,General Chemistry ,Condensed Matter Physics - Published
- 2022
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16. High-precision gaseous flame temperature field measurement based on quadriwave-lateral shearing interferometry
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Xun Yuan, Yuge Xue, Junwei Min, Xianghua Yu, Manman Li, Runze Li, and Baoli Yao
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Mechanical Engineering ,Electrical and Electronic Engineering ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2023
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17. Axial resolution enhancement for planar Airy beam light-sheet microscopy via the complementary beam subtraction method
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Yuan Zhou, Junwei Min, Dan Dan, Baoli Yao, Shuangyu Gu, Shaohui Yan, Chen Bai, Xing Li, Runze Li, Chao Liu, and Xianghua Yu
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Materials science ,Laser scanning ,Light ,business.industry ,Image quality ,Airy beam ,Brain ,Field of view ,Equipment Design ,Spores, Fungal ,Atomic and Molecular Physics, and Optics ,Mice ,Optics ,Planar ,Aspergillus ,Microscopy, Fluorescence ,Side lobe ,Light sheet fluorescence microscopy ,Animals ,Electrical and Electronic Engineering ,Visual Fields ,business ,Engineering (miscellaneous) ,Beam (structure) - Abstract
Airy beam light-sheet illumination can extend the field of view (FOV) of light-sheet fluorescence microscopy due to the unique propagation properties of non-diffraction and self-acceleration. However, the side lobes create undesirable out-of-focus background, leading to poor axial resolution and low image contrast. Here, we propose an Airy complementary beam subtraction (ACBS) method to improve the axial resolution while keeping the extended FOV. By scanning the optimized designed complementary beam that has two main lobes (TML), the generated complementary light-sheet has almost identical intensity distribution to that of the planar Airy light-sheet except for the central lobe. Subtraction of the two images acquired by double exposure respectively using the planar Airy light-sheet and the planar TML light-sheet can effectively suppress the influence of the out-of-focus background. The axial resolution improves from ∼ 4 µ m to 1.2 µm. The imaging performance was demonstrated by imaging specimens of aspergillus conidiophores and GFP labeled mouse brain section. The results show that the ACBS method enables the Airy beam light-sheet fluorescence microscopy to obtain better imaging quality.
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- 2021
18. Macroscopic traffic flow modelling of large-scale freeway networks with field data verification: State-of-the-art review, benchmarking framework, and case studies using METANET
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Yibing Wang, Xianghua Yu, Jinqiu Guo, Ioannis Papamichail, Markos Papageorgiou, Lihui Zhang, Simon Hu, Yongfu Li, and Jian Sun
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Automotive Engineering ,Transportation ,Management Science and Operations Research ,Civil and Structural Engineering - Published
- 2022
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19. Sea-urchin-structured NiCo2O4 decorated nitrogen-doped graphene for enhanced electrochemical detection of ascorbic acid
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Xingchao Chen, Zixian Yang, Xin Tuo, Huabo Huang, Juan Huang, Liang Li, and Xianghua Yu
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History ,Polymers and Plastics ,General Materials Science ,General Chemistry ,Business and International Management ,Condensed Matter Physics ,Industrial and Manufacturing Engineering - Published
- 2022
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20. Glucocorticoid promotes osteoblast viability by activating autophagy via the SGK1/FOXO3a signal pathway
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Xiaoming Xu, Xianghua Yu, and Shengxiang Zhang
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medicine.anatomical_structure ,Chemistry ,Autophagy ,medicine ,SGK1 ,Osteoblast ,Signal pathway ,Glucocorticoid ,medicine.drug ,Cell biology - Abstract
Background: Autophagy is important for cellular survival under numerous stimuli. Previous studies have demonstrated that endogenous glucocorticoids (GCs) could induce autophagy, contribute to bone metabolism and development under physiological condition, but the precise mechanisms involved are unknown. Methods: Mouse embryonic osteoblastic precursor cells, MC3T3-E1 cells, were treated with low dose of GCs (10-8M dexamethasone, Dex) and/or autophagy inhibitor, 3-methyladenine (3-MA) for different time periods. Gene interference with serum- and glucocorticoid induced kinase-1 (SGK1) was performed before above stimulations. After that, CCK-8 assay was performed to determine cell viability and the flow cytometry was performed to detect the apoptosis rates of the osteoblast cells. The expressions of SGK1, phosphorylated-FOXO3a (p-FOXO3a)/FOXO3 and autophagy-related proteins were detected with the western blotting. Results: A low dose (10-8M) of Dex induced a significant time-dependent increase in the expression and activation of SGK1 in MC3T3-E1 cells,accompanied by an increase in cell viability and decrease in cell apoptosis. 3-MA significantly inhibited the viability-promoting effect of Dex. Moreover, we found that Dex increased LC3II and Beclin-1 levels and decreased SQSTM/p62 levelin a time-dependent manner, which could be attenuated by pretreatment with 3-MA. Transfection of MC3T3-E1 cells exposed to Dex with shRNA-SGK1 resulted in a significant reduction in cell viability, and an increase in apoptosis. 3-MA further aggravated the effects of SGK1 inhibition on cell viability and apoptosis. Knocking down SGK1 before Dex exposure significantly downregulated p-FOXO3a/FOXO3, suppressed LC3II and Beclin-1 levels and increased SQSTM/p62 levels in MC3T3-E1 cells, which could be amplifies by 3-MA. Conclusions: A low dose of GCs increased osteoblast viability by activating autophagy via SGK1/FOXO3a pathway.
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- 2021
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21. Imaging Enhancement of Light-Sheet Fluorescence Microscopy via Deep Learning
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Dan Dan, Chao Liu, Baoli Yao, Shaohui Yan, Junwei Min, Xianghua Yu, Tong Peng, and Chen Bai
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Blind deconvolution ,business.industry ,Computer science ,Noise (signal processing) ,Image quality ,Noise reduction ,Subtraction ,Iterative reconstruction ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Optics ,Light sheet fluorescence microscopy ,Bessel beam ,Electrical and Electronic Engineering ,business - Abstract
The complementary beam subtraction (CBS) method can reduce the out-of-focus background and improve the axial resolution in light-sheet fluorescence microscopy (LSFM) via double scanning a Bessel and the complementary beams. With the assistance of a compressed blind deconvolution and denoising (CBDD) algorithm, the noise and blurring incurred during CBS imaging can be further removed. However, this approach requires double scanning and large computational cost. Here, we propose a deep learning-based method for LSFM, which can reconstruct high-quality images directly from the conventional Bessel beam (BB) light-sheet via a single scan. The image quality achievable with this CBS-Deep method is competitive with or better than the CBS-CBDD method, while the speed of image reconstruction is about 100 times faster. Accordingly, the proposed method can significantly improve the practicality of the CBS-CBDD system by reducing both scanning behavior and reconstruction time. The results show that this cost-effective and convenient method enables high-quality LSFM techniques to be developed and applied.
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- 2019
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22. Compressed Blind Deconvolution and Denoising for Complementary Beam Subtraction Light-Sheet Fluorescence Microscopy
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Baoli Yao, Ming Lei, Hao Jia, Tong Peng, Chen Bai, Chao Liu, Junwei Min, and Xianghua Yu
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Blind deconvolution ,Insecta ,Materials science ,Image quality ,business.industry ,Noise reduction ,Biomedical Engineering ,Reproducibility of Results ,Signal-To-Noise Ratio ,Data Compression ,Image Enhancement ,Sensitivity and Specificity ,Microspheres ,Optics ,Compressed sensing ,Signal-to-noise ratio ,Microscopy, Fluorescence ,Subtraction Technique ,Light sheet fluorescence microscopy ,Image Processing, Computer-Assisted ,Animals ,Deconvolution ,business ,Image resolution ,Algorithms - Abstract
Objective: The side-lobes of a Bessel beam (BB) create a severe out-of-focus background in scanning light-sheet fluorescence microscopy, thereby extremely limiting the axial resolution. The complementary beam subtraction (CBS) method can significantly reduce the out-of-focus background by double scanning a BB and its complementary beam. However, the blurring and noise caused by the system instability during the double scanning and subtraction operations degrade the image quality significantly. Therefore, we propose a compressed blind deconvolution and denoising (CBDD) method that solves this problem. Methods: We use a unified formulation that comprehensively takes advantage of multiple compressed sensing reconstructions and blind sparse representation. Results: The simulations and experiments were performed using the microbeads and model organisms to verify the effectiveness of the proposed method. Compared with the CBS light-sheet method, the proposed CBDD algorithm achieved the gain improvement in the axial and lateral resolution of about 1.81 and 2.22 times, respectively, while the average signal-to-noise ratio (SNR) was increased by about 3 dB. Conclusion: Accordingly, the proposed method can suppress the noise level, enhance the SNR, and recover the degraded resolution simultaneously. Significance: The obtained results demonstrate the proposed CBDD algorithm is well suited to improve the imaging performance of the CBS light-sheet fluorescence microscopy.
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- 2019
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23. 3D-printed interdigitated graphene framework as superior support of metal oxide nanostructures for remarkable micro-pseudocapacitors
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Xianghua Yu, Liang Li, Xiaocong Tian, Han Zhou, Hongyun Jin, Teng Wang, Kang Tang, and Shuen Hou
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Materials science ,Nanostructure ,Graphene ,General Chemical Engineering ,Non-blocking I/O ,Oxide ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,law.invention ,Micrometre ,chemistry.chemical_compound ,chemistry ,law ,Pseudocapacitor ,Electrochemistry ,Nanorod ,0210 nano-technology ,Nanosheet - Abstract
Micro-sized electrochemical energy storage device is a prospective candidate to power the miniaturized electronic devices and micro-pseudocapacitor (MPC) is a typical one with high power density and long life span. Developing a versatile architectural design with high capacity delivering in a micrometer range is paramount for remarkable MPC constructions. Here, an interdigitated graphene framework (IGF) is developed using a facile 3D printing technique to enable the customized geometries as well as the superior support of metal oxide nanostructures. With this unique design, the IGF-supported NiO nanorod heterostructured microelectrodes deliver high specific capacity of 220.2 C g−1 (400.3 F g−1). When directly assembled to quasi-solid-state symmetric MPCs, the NiO filled one exhibits a remarkable device capacity of 197.5 mC cm−2. Robust MPC cycling stabilities are also demonstrated during 10000 charge and discharge cycles. In addition to the NiO based ones, MnO2 nanosheet filled MPCs are also fabricated, where a high device capacity and a good cycling stability are also exhibited. We expect that this novel 3D-printed IGF can pave the way for constructing state-of-the-art miniaturized electrochemical energy storage devices with customized geometries.
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- 2019
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24. Facile Assembly of Polyaniline/Graphene Oxide Composite Hydrogels as Adsorbent for Cr(VI) Removal
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Xianghua Yu, Xiong Lijun, Lai Wei, Zhang Qiao, Huabo Huang, Liu Yulan, Liang Li, and Xiao Han
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Materials science ,Polymers and Plastics ,Graphene ,General Chemistry ,Oxide composite ,law.invention ,chemistry.chemical_compound ,Adsorption ,chemistry ,Chemical engineering ,law ,Polyaniline ,Self-healing hydrogels ,Materials Chemistry ,Ceramics and Composites ,Composite material - Published
- 2019
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25. [Promoting teaching quality by portfolio assessment in Cell Engineering classroom]
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Xianghua, Yu, Jinhua, Shao, Xiaowen, Liu, Yong, Zhang, and Yang, Liao
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Universities ,Humans ,Learning ,Curriculum ,Students ,Cell Engineering - Abstract
We introduce the portfolio assessment into the classroom teaching reform in the curriculum of Cell Engineering, a specialty course in bioengineeringbiotechnology. We established a complete classroom evaluation system that was divided the classroom assessment system of portfolio into four stages including the preparation stage, training stage, implementation stage and exhibition stage. We also discuss the feasibility and necessity of implementing the portfolio evaluation method in the course of cell engineering, the construction of evaluation system, and the key points and matters needing attention in the implementation process. The classroom reform is very productive, not only the classroom atmosphere has been activated, students' learning initiative and autonomy has been enhanced, but also the students' ability to analyze and solve professional problems related to cell engineering technology has been improved. The implementation of classroom teaching reform of this course can provide reference for other similar professional courses in colleges and universities.首次将成长记录袋评价法引入到高等院校生物类专业课程《细胞工程》的课堂教学改革中,构建了较为完备的课堂评价体系,将成长记录袋课堂评价体系的建立分为4个阶段,即准备阶段、演练阶段、实施阶段和作品展示阶段。并从实施成长记录袋评价法的可行性与必要性、评价体系的构建、执行过程中应注意的要点及事项分别展开论述。结果表明:通过该评价法的施行,不仅活跃了课堂气氛,增强了学生学习的主动性和自主性,还提高了学生分析、解决与细胞工程技术相关的专业问题的能力,执行效果良好。本课程课堂教学改革的实施,可为高校同类性质的其他专业课程提供借鉴与参考。.
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- 2021
26. Extended field of view of light-sheet fluorescence microscopy by scanning multiple focus-shifted Gaussian beam arrays
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Yuan Zhou, Shaohui Yan, Chen Bai, Junwei Min, Xing Li, Xianghua Yu, Chao Liu, Yanlong Yang, Baoli Yao, and Dan Dan
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Materials science ,Optical sectioning ,business.industry ,Gaussian ,Resolution (electron density) ,Field of view ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010309 optics ,symbols.namesake ,Optics ,Light sheet fluorescence microscopy ,0103 physical sciences ,Perpendicular ,symbols ,0210 nano-technology ,business ,Beam (structure) ,Gaussian beam - Abstract
Light-sheet fluorescence microscopy (LSFM) facilitates high temporal-spatial resolution, low photobleaching and phototoxicity for long-term volumetric imaging. However, when a high axial resolution or optical sectioning capability is required, the field of view (FOV) is limited. Here, we propose to generate a large FOV of light-sheet by scanning multiple focus-shifted Gaussian beam arrays (MGBA) while keeping the high axial resolution. The positions of the beam waists of the multiple Gaussian beam arrays are shifted in both axial and lateral directions in an optimized arranged pattern, and then scanned along the direction perpendicular to the propagation axis to form an extended FOV of light-sheet. Complementary beam subtraction method is also adopted to further improve axial resolution. Compared with the single Gaussian light-sheet method, the proposed method extends the FOV from 12 μm to 200 μm while sustaining the axial resolution of 0.73 μm. Both numerical simulation and experiment on samples are performed to verify the effectiveness of the method.
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- 2021
27. Real-time Freeway Traffic State Estimation with Fixed and Mobile Sensing Data
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Xianghua Yu, Lihui Zhang, Yonghui Hu, Simon Hu, Jingnan Cao, Mingming Zhao, Yibing Wang, and Jingqiu Guo
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Online model ,050210 logistics & transportation ,Computer science ,Estimation theory ,Mobile broadband ,010102 general mathematics ,05 social sciences ,Real-time computing ,Context (language use) ,Traffic flow ,01 natural sciences ,Microscopic traffic flow model ,0502 economics and business ,State (computer science) ,0101 mathematics - Abstract
This paper compares three filtering approaches to real-time freeway traffic state estimation based on the first-order and second-order macroscopic traffic flow models using fixed and mobile data together data together. The significance of online estimation of traffic flow model parameters along with traffic flow variables is also investigated in the context of heterogeneous sources of sensing data. The results indicate that the traffic state estimator based on a second-order model outperforms those based on the first-order models. In addition, the online model parameter estimation is significant for traffic state estimation especially when the penetration rate of mobile sensors is lower than 20%.
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- 2020
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28. Freeway Traffic Control in the Presence of Capacity Drop
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Yibing Wang, Xianghua Yu, and Siyu Zhang
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Drop (liquid) ,Freeway traffic control ,Environmental science ,Automotive engineering - Published
- 2020
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29. Real-time joint traffic state and model parameter estimation on freeways with fixed sensors and connected vehicles: State-of-the-art overview, methods, and case studies
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Yibing Wang, Mingming Zhao, Xianghua Yu, Yonghui Hu, Pengjun Zheng, Wei Hua, Lihui Zhang, Simon Hu, and Jingqiu Guo
- Subjects
Automotive Engineering ,Transportation ,Management Science and Operations Research ,Civil and Structural Engineering - Published
- 2022
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30. Morphology-controlled fabrication of polypyrrole hydrogel for solid-state supercapacitor
- Author
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Huabo Huang, Xianghua Yu, Liang Li, Jinyu Bo, Wei Lai, and Xiaofeng Luo
- Subjects
Supercapacitor ,Conductive polymer ,Materials science ,Fabrication ,Renewable Energy, Sustainability and the Environment ,Energy Engineering and Power Technology ,Nanoparticle ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Polypyrrole ,Electrochemistry ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Self-healing hydrogels ,Ammonium persulfate ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,0210 nano-technology - Abstract
Conducting polypyrrole (PPy) hydrogels are considered as one promising class of materials for high performance supercapacitors because they synergize the unique features of conducting polymers and hydrogels with three-dimensional porous network. PPy hydrogels are synthesized in the absence of any additional crosslinkers by using ammonium persulfate as the oxidizing agent and sodium dodecylsulfonate as the surfactant. The as-prepared hydrogels exhibit nanoparticle-based porous networks with high surface area and electrical conductivity. The effect of different oxidants on the formation and the morphology of PPy hydrogels are also studied. The facile synthesis method offers PPy hydrogels morphology-controllable nanostructures and good mechanical property, as well as scalable processability. Moreover, PPy hydrogels coated on carbon cloth as binder free electrodes are further used for the fabrication of a symmetric solid-state supercapacitor with good rate capability, cyclic stability and bendable performance. Based on the simple fabrication and electrochemical performances, this PPy hydrogel can be expected as a potential material for flexible energy storage device.
- Published
- 2018
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- View/download PDF
31. Facile synthesis of nitrogen-doped graphene aerogels for electrochemical detection of dopamine
- Author
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Xiong Lijun, Shun Ai, Xianghua Yu, Huabo Huang, Yuxin Chen, Liang Li, Zhang Qiao, Lai Wei, and Liu Yulan
- Subjects
Materials science ,Graphene ,Oxide ,Aerogel ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Microstructure ,Ascorbic acid ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,Aniline ,chemistry ,Chemical engineering ,law ,Specific surface area ,General Materials Science ,0210 nano-technology ,Melamine - Abstract
Nitrogen-doped graphene aerogels with three-dimensional network structures are fabricated using hydrothermal method which includes the reduction of graphene oxide by organic amine and self-assembly of reduced graphene oxide. The effect of amine-containing compounds including aniline, 2-aminoethanol, ethylenediamine, melamine and chitosan on the assembly of nitrogen-doped graphene aerogel is investigated. The microstructure and chemical composition of nitrogen-doped graphene aerogels are characterized. The results reveal that nitrogen-doped graphene aerogel prepared using aniline as nitrogen source possesses a large specific surface area, high nitrogen content, good mechanical strength and excellent electrical conductivity. Based on these features, the as-prepared nitrogen-doped graphene aerogel shows high performance in electrochemical detection of dopamine in the presence of uric acid and ascorbic acid. Given the facile and scalable processability of aerogels, the proposed nitrogen-doped graphene aerogels are expected to have potential applications in sensors and other related devices.
- Published
- 2018
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- View/download PDF
32. High-performance poly(vinyl alcohol)–chitosan sponge modified with graphene oxide
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Xianghua Yu, Liang Li, Xiong Lijun, Duanli Wei, Huabo Huang, Lai Wei, and Xiaofeng Luo
- Subjects
Vinyl alcohol ,Fabrication ,Materials science ,Polymers and Plastics ,Scanning electron microscope ,Oxide ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,law.invention ,Chitosan ,chemistry.chemical_compound ,law ,Amphiphile ,Materials Chemistry ,biology ,Graphene ,technology, industry, and agriculture ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,biology.organism_classification ,0104 chemical sciences ,Sponge ,chemistry ,Chemical engineering ,0210 nano-technology - Abstract
Three-dimensional porous sponge with good mechanical strength, high absorption capacity and recyclability is of scientific and technological interest. In this work, graphene oxide has been incorporated into poly(vinyl alcohol)–chitosan sponge during acetalization reaction of poly(vinyl alcohol) for the fabrication of macroporous and amphiphilic sponges. Mercury intrusion porosimetry and scanning electron microscopy indicate that the as-prepared sponges have interconnected open-cell structures. The incorporation of graphene oxide and the interconnected macroporous structures in the amphiphilic sponges endow them with improved absorption capacity for both water and organic liquids. Moreover, the absorbed liquids can be effectively collected through simple squeezing and the sponges can be used repeatedly while maintaining a relative high absorption capacity. The simple fabrication and improved performance of the resulting sponges suggest that they have potential industrial applications.
- Published
- 2018
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- View/download PDF
33. Elastic polypyrrole hydrogels reinforced by TEMPO-oxidized cellulose for supercapacitors
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Xianghua Yu, Xiongwei Zhu, Huabo Huang, Li Liang, Liu Yulan, Hanwei Du, and Fenyu Wang
- Subjects
Conductive polymer ,Supercapacitor ,Materials science ,Mechanical Engineering ,Oxidized cellulose ,Metals and Alloys ,Nanotechnology ,Condensed Matter Physics ,Polypyrrole ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,chemistry ,Polymerization ,Mechanics of Materials ,Self-healing hydrogels ,Materials Chemistry ,Methyl orange ,Cellulose - Abstract
Elastic conducting hydrogel is a promising candidate for the construction of high-performance electronic devices because of the unique mechanical and electrical features of conducting hydrogel with three-dimensional network. But conducting polymers are considered to be inherently rigid due to the conjugated chains in the macromolecular structures, leading to poor processability. Making conducting polymer hydrogels elastic by a rational and facile design is paramount for the construction of remarkable electronic device. Here, elastic polypyrrole (PPy) hydrogels reinforced by TEMPO-oxidized cellulose are obtained in the presence of methyl orange and FeCl3 during the static polymerization and self-assembly process. The as-prepared hydrogels exhibit one-dimensional nanotubes-based porous networks with electric conductivity, high elasticity and mechanical stability. With this special design, the symmetric quasi-solid-state supercapacitor fabricated by PPy hydrogels reinforced by TEMPO-oxidized cellulose electrodes deliver good electrochemical performance and can be connected in series as an electronic circuit to light up a LED bulb. All of the characteristics of the resulting PPy hydrogels reinforced by TEMPO-oxidized cellulose open an avenue for potential energy storage applications.
- Published
- 2021
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34. Graphene oxide/polypyrrole/polyaniline composite hydrogel synthesized by vapor-liquid interfacial method for supercapacitors
- Author
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Haonan Wang, Zhongyu Zhao, Xianghua Yu, Huabo Huang, and Li Liang
- Subjects
Conductive polymer ,Supercapacitor ,Materials science ,Graphene ,Composite number ,Oxide ,Polypyrrole ,law.invention ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,chemistry ,Polymerization ,Chemical engineering ,law ,Polyaniline - Abstract
The main research about the preparation of the conducting polymer/graphene composite hydrogel has been focused on the hydrothermal synthesis or the external gel accelerator. Herein, the composite hydrogel based on graphene oxide (GO) and polypyrrole (PPy) and polyaniline (PANI) is fabricated via vapor-liquid interfacial synthesis. FeCl3 and GO are dispersed in an aqueous solution. Then, the polymerization of pyrrole and aniline occurs on the interface between their vapor and the above aqueous solution. The effect of FeCl3 and GO on formation, morphology and performance of composite hydrogel of GO/PPy/PANI is investigated. Furthermore, the specific capacitance of hydrogel is larger than that of composite film obtained without the addition of GO. After 2000 electrochemical cycles at a scan rate of 1 A g−1, about 91% of the specific capacitance of GO/PPy/PANI composite hydrogel is kept, indicating the enhanced cyclic stability of composite hydrogel. Moreover, graphite paper can be coated by GO/PPy/PANI composite hydrogels and used as binder-free electrodes to construct a flexible solid-state symmetric supercapacitor with excellent cyclic stability and rate capability. This work reveals an easy, efficient, and scalable route for the preparation of the conducting composite hydrogel with improved electrochemical performance.
- Published
- 2021
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- View/download PDF
35. Fabrication of poly(N-methylpyrrole) nanotubes for detection of dopamine
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Liang Li, Huabo Huang, Xianghua Yu, Yineng Huang, Liu Yulan, and Huizhi Xiong
- Subjects
Thermogravimetric analysis ,Materials science ,Polymers and Plastics ,Scanning electron microscope ,Analytical chemistry ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Microstructure ,Ascorbic acid ,01 natural sciences ,0104 chemical sciences ,Polymerization ,Transmission electron microscopy ,Materials Chemistry ,Fourier transform infrared spectroscopy ,0210 nano-technology ,Powder diffraction ,Nuclear chemistry - Abstract
Poly(N-methylpyrrole) nanotubes were facilely fabricated by in situ chemical polymerization via a reactive template of MnO2 and were developed as electrode materials for the detection of dopamine. The microstructure, morphology, and chemical composition of the as-prepared poly(N-methylpyrrole) nanotubes have been investigated by X-ray powder diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Furthermore, a glassy carbon electrode (GCE) was modified with poly(N-methylpyrrole) nanotubes and showed sensitive catalytic activity for electrochemical detection of low concentration of dopamine even in the presence of and ascorbic acid.
- Published
- 2017
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- View/download PDF
36. Fabrication of Polypyrrole/Chitosan Nanocomposite Aerogel Monolith for Removal of Cr(VI)
- Author
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Jiayou Ji, Huizhi Xiong, Xianghua Yu, Liang Li, Zhenni Zhu, and Yineng Huang
- Subjects
geography ,Environmental Engineering ,Materials science ,geography.geographical_feature_category ,Nanocomposite ,Polymers and Plastics ,Aerogel ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Polypyrrole ,01 natural sciences ,0104 chemical sciences ,Chitosan ,chemistry.chemical_compound ,Adsorption ,chemistry ,Chemical engineering ,Polymerization ,Polymer chemistry ,Materials Chemistry ,Glutaraldehyde ,Monolith ,0210 nano-technology - Abstract
Three-dimensional polypyrrole/chitosan nanocomposite monoliths are fabricated by polymerization of pyrrole in chitosan aqueous solution. The static polymerization of pyrrole monomer and the cross-linking of chitosan by glutaraldehyde occur simultaneously, resulting in the self-assembly of polypyrrole/chitosan nanocomposite aerogel monolith. The addition of methyl orange and glutaraldehyde and the static reaction play key roles in the formation of the self-standing aerogel monolith. The as-prepared monolith with larger specific surface area exhibits much better adsorption capability for Cr(VI) removal in comparison with that prepared without the addition of glutaraldehyde. The adsorption process and adsorption isotherms are found to well follow the pseudo-second-order and Langmuir models, respectively. Furthermore, this polypyrrole/chitosan nanocomposite monolith is stable and recyclable. About 73.5% of the initial adsorption capability is kept after eight adsorption–desorption cycles. The polypyrrole/chitosan nanocomposite monolith can be a promising candidate for the efficient removal of Cr(VI).
- Published
- 2017
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- View/download PDF
37. Interfacial fabrication of polypyrrole/sulfonated reduced graphene oxide nanocomposites for electrochemical capacitors
- Author
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Liu Yulan, Liang Li, Huizhi Xiong, Huabo Huang, Xianghua Yu, Yineng Huang, Man Xu, and Jiayou Ji
- Subjects
Nanocomposite ,Materials science ,Polymers and Plastics ,Dopant ,Graphene ,Oxide ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,Polypyrrole ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,chemistry ,law ,Specific surface area ,Materials Chemistry ,Ceramics and Composites ,Composite material ,0210 nano-technology ,Graphene oxide paper - Abstract
The hierarchical polypyrrole/sulfonated reduced graphene oxide nanocomposites were synthesized via water/organic liquid interfacial fabrication. Sulfonated reduced graphene oxide with negative charges acted as the dopant of polypyrrole during the process of interfacial fabrication, which efficiently prompted the incorporation of sulfonated reduced graphene oxide in the polypyrrole matrix through the interfacial interaction between polypyrrole and sulfonated reduced graphene oxide. The effect of organic liquid on the microstructure and supercapacitive performance of the nanocomposites was investigated. In the case of hexane as the organic liquid, a high specific capacity of 265.6 F g−1 at a current density of 1 A g−1 was obtained from the polypyrrole/sulfonated reduced graphene oxide nanocomposite, and about 90% of the initial capacity was retained after 1,000 cycles. The improved electrochemical capacitance of the nanocomposite was ascribed to the combinative properties of good electrical conductivities of two components and the unique structure with increased specific surface area. These nanocomposites could be promising electrode materials for high-performance electrochemical capacitors. POLYM. COMPOS., 2017. © 2017 Society of Plastics Engineers
- Published
- 2017
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- View/download PDF
38. Electrochemical synthesis of graphene/polypyrrole nanotube composites for multifunctional applications
- Author
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Xianghua Yu, Huizhi Xiong, Yineng Huang, Zhuo Cai, Liang Li, Huabo Huang, and Zhenni Zhu
- Subjects
Nanotube ,Materials science ,Composite number ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,Electrochemistry ,Polypyrrole ,01 natural sciences ,law.invention ,chemistry.chemical_compound ,law ,Materials Chemistry ,Graphene oxide paper ,Supercapacitor ,Graphene ,Mechanical Engineering ,Metals and Alloys ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,chemistry ,Mechanics of Materials ,Electrode ,0210 nano-technology - Abstract
A conducting composite film has been fabricated using graphene oxide (GO) and pre-prepared one-dimensional polypyrrole (PPy) nanotube as the feedstock. GO with various oxygen-containing groups effectively promotes the dispersion of well-defined PPy nanotubes to obtain a stable and homogeneous GO/PPy complex solution. By a one-step and large-scale electrochemical reduction, the graphene/PPy nanotube composite film is successfully synthesized. Graphene nanosheets uniformly cover the surface of the electrode and PPy nanotubes act as spacers and conducting bridges to prevent the restacking of graphene sheets and connect the isolated graphene nanosheets. Electrochemical experiments indicate that the composite films have high performances due to the combination of the advantages of graphene and PPy nanotube. When the graphene/PPy nanotube composite is directly used as the supercapacitor electrode, it shows high specific capacitance and good cycling stability during 1000 charge/discharge cycles. Furthermore, an electrochemical biosensor is constructed through the entrapment of horseradish peroxidase (HRP) onto the composite film-modified glassy carbon electrode (GCE). The immobilized HRP showed high catalytic activity for the reduction of H 2 O 2 , which may be ascribed to high conductivity, great surface coverage, and good biocompatibility of the prepared graphene/PPy nanotube composite film. This method may be extended to prepare other conducting composite films with structure-controllable nanostructures in large scale for the application of electrochemical fields.
- Published
- 2017
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- View/download PDF
39. Robust contrast-transfer-function phase retrieval via flexible deep learning networks: publisher's note
- Author
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Peng Zhang, Junwei Min, Tong Peng, Baoli Yao, Meiling Zhou, Chen Bai, Shipei Dang, and Xianghua Yu
- Subjects
Contrast transfer function ,business.industry ,Computer science ,Deep learning ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010309 optics ,Optics ,0103 physical sciences ,Artificial intelligence ,0210 nano-technology ,business ,Phase retrieval ,Algorithm - Abstract
This publisher’s note contains corrections to Opt. Lett.44, 5141 (2019)OPLEDP0146-959210.1364/OL.44.005141.
- Published
- 2019
40. Preventing Freeway Capacity Drop via MTFC and Ramp Metering
- Author
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Xianghua Yu, Yibing Wang, and Siyu Zhang
- Subjects
050210 logistics & transportation ,Computer science ,Traffic flow control ,0502 economics and business ,05 social sciences ,Drop (telecommunication) ,Metering mode ,010501 environmental sciences ,Optimal control ,01 natural sciences ,Automotive engineering ,0105 earth and related environmental sciences - Abstract
Capacity drop at congested freeway bottlenecks is well known with a lot of field observations and accounts for severe performance degradation of road infrastructure. This paper addresses freeway ramp metering and mainstream traffic flow control (MTFC) at active bottlenecks, with an aim of avoiding capacity drop. A special attention was paid to the effects of capacity drop on the performance of control measures. Via mathematical analyses, it was first shown that the significance and usefulness of the control measures are justified by the presence of capacity drop in field. This was then verified via macroscopic simulation studies, with ramp metering, MTFC, and their integration formulated in a framework of coordinated and integrated optimal control. It was also demonstrated that an appropriate usage of the control measures can effectively prevent the activation of potential bottlenecks on freeways and hence avoid capacity drop there.
- Published
- 2019
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- View/download PDF
41. A Dynamic Simulation Method of Global Energy Interconnection Evolution Process
- Author
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Shiwen Wang, Qian Li, Xianghua Yu, Liting Wang, Xin Yang, and Zhe Chen
- Subjects
Imagination ,Interconnection ,Mathematical optimization ,business.industry ,Process (engineering) ,Computer science ,020209 energy ,media_common.quotation_subject ,Differential (mechanical device) ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Renewable energy ,Dynamic simulation ,Heun's method ,Order (exchange) ,0202 electrical engineering, electronic engineering, information engineering ,business ,0105 earth and related environmental sciences ,media_common - Abstract
Global energy interconnection (GEI) is of great significance to realize the worldwide optimal utilization of renewable energy, which is facing numerous challenges. In order to tackle underlying challenges and support decision making, the simulation of GEI evolution process makes sense. A dynamic GEI simulation method is proposed for the prediction of evolution process and the capture of critical challenges. The critical affecting factors of GEI evolution process, such as the international politics and economy, are analyzed. Then, the GEI evolution process is modeled as a differential kinetic equation that consists of the impacts of international politics and economy. Additionally, the improved Euler method is utilized to solve the dynamic model and the GEI evolution process is obtained. Finally, simulation results show the validity and effectiveness of proposed method.
- Published
- 2019
- Full Text
- View/download PDF
42. Response of rhizosphere bacterial community of Taxus chinensis var. mairei to temperature changes
- Author
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Xinxing Liu, Xueduan Liu, and Xianghua Yu
- Subjects
0106 biological sciences ,0301 basic medicine ,Leaves ,Plant Science ,01 natural sciences ,Biochemistry ,Antioxidants ,Database and Informatics Methods ,Plant Resistance to Abiotic Stress ,Medicinal Plants ,Medicinal plants ,Soil Microbiology ,chemistry.chemical_classification ,Rhizosphere ,Multidisciplinary ,biology ,Ecology ,Physics ,Plant Anatomy ,Temperature ,Classical Mechanics ,Eukaryota ,Plants ,Enzymes ,Dismutases ,Taxus ,Plant Physiology ,Physical Sciences ,Medicine ,Mechanical Stress ,Soil microbiology ,Sequence Analysis ,Peroxidase ,Research Article ,Bioinformatics ,Science ,Sequence Databases ,Research and Analysis Methods ,Superoxide dismutase ,03 medical and health sciences ,Plant-Environment Interactions ,Botany ,Plant Defenses ,Reactive oxygen species ,Bacteria ,Superoxide Dismutase ,Plant Ecology ,Ecology and Environmental Sciences ,Organisms ,Biology and Life Sciences ,Proteins ,Plant Pathology ,biology.organism_classification ,030104 developmental biology ,Thermal Stresses ,Biological Databases ,chemistry ,biology.protein ,Enzymology ,Reactive Oxygen Species ,010606 plant biology & botany - Abstract
Background Temperature is a key factor influencing the growth and distribution of Taxus chinensis var. mairei, which is of high medicinal value. However, there is little information about the changes in rhizosphere bacterial community of Taxus chinensis var. maire under different temperatures. Methods In this study, the rhizosphere bacterial communities of Taxus chinensis var. maire under a series of temperatures [5°C (T5), 15°C (T15), 25°C (T25), 35°C (T35)] were assessed through high-throughput sequencing. And some taxa annotated as Mitochondria were positively correlated with the activity of SOD. Results Activity of peroxidase (POD) and superoxide dismutase (SOD) were increased and decreased respectively with increasing incubation temperature, showing that SOD may be the dominant reactive oxygen species (ROS) detoxifying enzyme in Taxus chinensis var. maire under low temperature. Taxus chinensis var. maire enriched specific bacterial taxa in rhizosphere under different temperature, and the rhizosphere bacterial diversity decreased with increasing temperature. Conclusion The results indicated that rhizosphere bacteria may play important role for Taxus chinensis var. maire in coping with temperature changes, and the management of rhizosphere bacteria in a potential way to increase the cold resistance of Taxus chinensis var. mairei, thus improving its growth under low temperature and enlarging its habitats.
- Published
- 2019
43. Real-time optical manipulation of particles through turbid media
- Author
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Sha An, Chen Bai, Chunmin Zhang, Ming Lei, Runze Li, Tong Peng, Peng Zhang, Xianghua Yu, Meiling Zhou, Yansheng Liang, and Baoli Yao
- Subjects
Wavefront ,Scattering ,business.industry ,Computer science ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010309 optics ,Optical imaging ,Optics ,0103 physical sciences ,Medical imaging ,0210 nano-technology ,business ,Phase modulation - Abstract
Complex diffusive scattering media pose significant challenges for light focusing as well as optical imaging to be implemented in practice. Recently, it has been demonstrated that the wavefront shaping technique can be applied to realize focusing and imaging through scattering medium. Here we report dynamic optical manipulation of particles through turbid media by employing the interleaved segment wavefront correction method, which is an improved genetic algorithm providing faster convergence speed and higher peak to background ratio. Manipulating micro-beads behind a scattering medium along both one and two dimensional predesigned trajectories in real time has been successfully demonstrated.
- Published
- 2019
44. Synthesis of hierarchical reduced graphene oxide/SnO 2 /polypyrrole ternary composites with high electrochemical performance
- Author
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Liang Li, Changlian Chen, Huabo Huang, Sibo Li, Weiqian Zheng, Yineng Huang, and Xianghua Yu
- Subjects
Supercapacitor ,Materials science ,Graphene ,Mechanical Engineering ,Composite number ,Oxide ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Polypyrrole ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,law ,Methyl orange ,General Materials Science ,Composite material ,0210 nano-technology ,Ternary operation ,Graphene oxide paper - Abstract
The hierarchical reduced graphene oxide/SnO 2 /polypyrrole ternary composites are prepared in a one-pot method via in situ redox reaction between graphene oxide and Sn 2+ ions, followed by the polymerization of pyrrole monomers in the presence of methyl orange. The ternary composites are composed of one-dimensional polyprrole nanofibers and SnO 2 nanoparticles distributed in the network of graphene nanosheets. Supercapacitors based on the hierarchical composite show larger specific capacitance compared with the ternary composite prepared without methyl orange and reduced graphene oxide/SnO 2 binary composite. They also exhibit superior electrochemical rate capability and cyclic stability. The capacitance retained about 95% after 800 galvanostatic cycles at 1 A/g. The high electrochemical performance results from the hierarchical nanostructure, the efficient combination of components and the synergistic interaction among the three components. The hierarchical ternary composites are promising electrode material for high-performance supercapacitors.
- Published
- 2016
- Full Text
- View/download PDF
45. Facile fabrication of elastic conducting polypyrrole nanotube aerogels
- Author
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Weiqian Zheng, Bingrui Li, Yineng Huang, Xiao She, Shu Ying, Xianghua Yu, Zhiliang Huang, Liang Li, Zhitian Liu, and Huabo Huang
- Subjects
Nanotube ,Fabrication ,Materials science ,Scanning electron microscope ,02 engineering and technology ,Conductivity ,010402 general chemistry ,Polypyrrole ,01 natural sciences ,chemistry.chemical_compound ,symbols.namesake ,Materials Chemistry ,Composite material ,Mechanical Engineering ,Metals and Alloys ,Aerogel ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,chemistry ,Mechanics of Materials ,Transmission electron microscopy ,symbols ,0210 nano-technology ,Raman spectroscopy - Abstract
Elastic conducting polypyrrole nanotube aerogels are fabricated through static assembly in the aqueous phase and freeze-drying method. The microstructures and properties were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman, strain-stress and electrical conductivity measurements. The elastic aerogel can be compressed by 60% and recover to its original shape within seconds. Moreover, it can remain their structural integrity under hundreds of compression/release cycles. The unique microstructures endow the elastic aerogel with an extremely fast recovery, accompanied with quick change of conductivity. All of the features of the resulting polypyrrole nanotube aerogels render them attractive for potential stress sensing and energy conversion/storage applications.
- Published
- 2016
- Full Text
- View/download PDF
46. Reinforced polyaniline/polyvinyl alcohol conducting hydrogel from a freezing–thawing method as self-supported electrode for supercapacitors
- Author
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Xiaoping Zeng, Liang Li, Junlong Yao, Xianghua Yu, Zhiliang Huang, Zhu Fen, Zhitian Liu, and Huabo Huang
- Subjects
Conductive polymer ,Materials science ,Nanoporous ,Mechanical Engineering ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Polyvinyl alcohol ,0104 chemical sciences ,Dielectric spectroscopy ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,Electrode ,Polyaniline ,General Materials Science ,Composite material ,Cyclic voltammetry ,In situ polymerization ,0210 nano-technology - Abstract
In the present work, by using the in situ polymerization of aniline in acidic aqueous solution of PVA and freezing–thawing method, the reinforced conducting polymer hydrogel of polyaniline/polyvinyl alcohol (PANI/PVA) was prepared and directly used as the self-supported electrode for supercapacitor. The chemical structure of PANI/PVA hydrogel was characterized by UV–Vis, and the three-dimensional (3D) interconnected hierarchical nanoporous structure was observed by scanning electron microscopy. The measurement of compressive strength demonstrated the high mechanical strength of the hydrogel. The electrochemical properties of PANI/PVA hydrogel electrodes were evaluated by using cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge, which indicated their good responsiveness and rate capability, low resistance, high specific capacitance (240 F/g at current density of 1 A/g) and excellent cycling stability. The easily fabricated PANI/PVA hydrogel combined hierarchical nanoporous microstructure, self-supported feature and favorable capacitive behavior and provided a new strategy for constructing high-performance electrode for supercapacitors.
- Published
- 2016
- Full Text
- View/download PDF
47. Growth of silver nanoparticles on poly(acrylic acid) brushes and their properties
- Author
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Shu Ying, Xianghua Yu, Liang Li, Weiqian Zheng, Da Yumin, and Xiaoya Zhang
- Subjects
chemistry.chemical_classification ,Acrylate ,Materials science ,Polymers and Plastics ,technology, industry, and agriculture ,Substrate (chemistry) ,02 engineering and technology ,General Chemistry ,Polymer ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Silver nanoparticle ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Polymer chemistry ,Materials Chemistry ,Acid hydrolysis ,0210 nano-technology ,Layer (electronics) ,Methylene blue ,Acrylic acid - Abstract
A simple procedure is employed for the growth of silver nanoparticles (Ag NPs) onto the silicon substrate modified by poly(acrylic acid) (PAA) brushes, via: (1) surface-initiated ATRP of tert-butyl acrylate on Si surface to the preparation of poly(tert-butyl acrylate) brushes, (2) acid hydrolysis of PBA to the formation of PAA, and (3) in situ synthesis of Ag NPs via chemical reduction of AgNO3 in the presence of PAA brushes. The polymer brushes are thoroughly characterized. Moreover, Ag nanoparticles are homogeneously immobilized into the brush layer and have been used to fabricate a sensor platform of surface-enhance Raman scattering for the detection of organic molecules and effectively catalyze the reduction of methylene blue by NaBH4.
- Published
- 2016
- Full Text
- View/download PDF
48. Facile synthesis of magnetic polypyrrole composite nanofibers and their application in Cr(VI) removal
- Author
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Liang Li, Bingrui Li, Xin Tuo, Hong Cao, Zhiliang Huang, Changlian Chen, Xianghua Yu, and Yineng Huang
- Subjects
Nanocomposite ,Aqueous solution ,Materials science ,Polymers and Plastics ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Polypyrrole ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,Adsorption ,Polymerization ,chemistry ,Materials Chemistry ,Ceramics and Composites ,Methyl orange ,Water treatment ,Composite material ,0210 nano-technology ,Pyrrole - Abstract
The magnetic polypyrrole (PPy) composite nanofibers are prepared in a simple one-pot method via in situ chemical polymerization of pyrrole in the presence of methyl orange, followed by the treatment of ammonia solution. The effect of methyl orange (MO) on the morphology of the magnetic PPy nanocomposites was investigated. The composite nanofibers were used as an efficient adsorbent to remove Cr(VI) from aqueous solutions. Moreover, because of the magnetic Fe3O4 nanoparticles in the composites, it is easy for the composites to be separated from waste water by external magnet. These composites with hierarchical structures are expected to be a potential candidate for water treatment. POLYM. COMPOS., 2016. © 2016 Society of Plastics Engineers
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- 2016
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- View/download PDF
49. Facile assembly of polypyrrole/Prussian blue aerogels for hydrogen peroxide reduction
- Author
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Changlian Chen, Bingrui Li, Xianghua Yu, Huabo Huang, Zhiliang Huang, Liang Li, and Xin Tuo
- Subjects
Prussian blue ,Materials science ,Mechanical Engineering ,Inorganic chemistry ,Metals and Alloys ,Aerogel ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Polypyrrole ,Electrochemistry ,01 natural sciences ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,chemistry ,X-ray photoelectron spectroscopy ,Mechanics of Materials ,Materials Chemistry ,Methyl orange ,Ferricyanide ,Fourier transform infrared spectroscopy ,0210 nano-technology ,Nuclear chemistry - Abstract
Three-dimensional self-standing polypyrrole/Prussian blue (PPy/PB) aerogel monoliths have been fabricated through self-assembly of PPy/PB hydrogel precursors and subsequent freeze-drying. The hydrogel precursors are synthesized using methyl orange as the self-degraded template in the presence of ferricyanide as the oxidant. The morphology, crystalline structure and chemical composition of the resulting PPy/PB aerogels have been investigated by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Moreover, the as-prepared PPy/PB aerogels exhibit well-defined response in the electrocatalytic reduction of hydrogen peroxide (H 2 O 2 ) owing to the combination of the electrochemical properties of PB and the conductivity of PPy in the aerogels. These aerogels with the multifunctional quality are expected to have wide applications in sensor and other related fields.
- Published
- 2016
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50. Super-resolution and optical sectioning integrated structured illumination microscopy
- Author
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Dan Dan, Ming Lei, Tianyu Zhao, Xianghua Yu, Junwei Min, Peng Gao, Baoli Yao, Shipei Dang, and Jia Qian
- Subjects
Optics ,Image reconstruction algorithm ,Materials science ,Acoustics and Ultrasonics ,Optical sectioning ,business.industry ,Structured illumination microscopy ,Imaging technique ,Condensed Matter Physics ,business ,Superresolution ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Abstract
Super-resolution structured illumination microscopy (SR-SIM) has attracted a great deal of attention in the past few decades. As a wide-field imaging technique, SR-SIM usually suffers from issues relating to out-of-focus background, particularly when imaging thick samples. In this study, we develop an integrated SIM with simultaneous SR and optical sectioning (OS) capabilities, facilitating SR imaging of stacked optical sections, with the out-of-focus background suppressed. The combination of the merits of SR and OS is realized by means of a new image reconstruction algorithm. We confirm the validity of the integrated SIM, both experimentally and in simulation. We anticipate that this integrated SIM will assist biologists in obtaining much clearer SR images in relation to thick specimens.
- Published
- 2020
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