25 results on '"Wu, Hualin"'
Search Results
2. The application of the PDCA cycle in the nutritional management of patients with nasopharyngeal carcinoma
- Author
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Zeng, Xiaofen, Huang, Xueling, Wang, Pengpeng, Liao, Jinlian, Wu, Liucong, Liu, Jieying, Wu, Hualin, and Wei, Rongsa
- Published
- 2023
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- View/download PDF
3. Optical ammonia sensor based on Yb3+, Er3+, Tm3+ co-doped NaYF4 up-conversion material/phenol red composites
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Wu, Hualin, Zhang, Xianming, Zhao, Ying, Leng, Xuefeng, Xinyue, Huang, and Li, Bangxing
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- 2022
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4. An Acceptor–Donor–Acceptor Molecule Tailored Versatile Buffer Enabling Efficient and Stable Perovskite Solar Cells.
- Author
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Si, Shenglin, Yin, Tianzhou, Guo, Yixuan, Zhang, Zimin, Wen, Haoxin, Tan, Haiting, Luo, Wenqiang, Zhang, Zhen, Wu, Hualin, and Huang, Shaoming
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ENERGY levels (Quantum mechanics) ,SOLAR cells ,BUFFER layers ,HYDROPHOBIC interactions ,CRYSTAL grain boundaries - Abstract
Interface in perovskite solar cells (PSCs) is of vital importance because it dominates deep‐level defects and non‐radiative recombination, thus impacting both efficiency and stability further. Herein, a symmetrical acceptor–donor–acceptor (A–D–A) conjugated molecule with the core architecture of terthieno[3,2‐b hiophene and 2‐(3‐oxo‐2,3‐dihydro‐1 H‐inden‐1‐ylidene)malononitrile, named 6TIC, as a versatile buffer layer, is adopted to enhance photovoltaic performance and stability simultaneously. It is found that the conjugated molecule filling at grain boundaries and surface can not only chemically anchor with perovskite components to substantially eliminate interfacial defects and suppress detestable non‐radiative recombination, but also effectively improve the energy level alignment and facilitate charge transfer efficiency at the interface, resulting in an excellent power conversion efficiency of 24.81% with an admirable fill factor of 84.5%. Furthermore, benefiting from the unexceptionable surface protection effect of the hydrophobic buffer layer, greatly improved operational stability is delivered, with retaining 90% of initial efficiency for 960 h aging in a relative humidity of 60 ± 5% air and 1450 h aging under continuous 85 °C heating stress. This strategy may provide a new avenue for advancing high‐efficiency and stable PSCs. [ABSTRACT FROM AUTHOR]
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- 2024
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5. Simultaneous Ultraviolet Conversion and Defect Passivation Stabilize Efficient and Operational Durable Perovskite Solar Cells.
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Luo, Wenqiang, Wen, Haoxin, Guo, Yixuan, Yin, Tianzhou, Tan, Haiting, Zhang, Zimin, Si, Shenglin, Zhang, Zhen, Wu, Hualin, and Huang, Shaoming
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ENERGY levels (Quantum mechanics) ,SOLAR cells ,ULTRAVIOLET radiation ,VISIBLE spectra ,HYDROGEN bonding - Abstract
Despite the swift development in perovskite solar cells (PSCs), great concerns regarding environmental vulnerability propose a big challenge for their long‐term operational stability. Herein, a novel functionalized ultraviolet (UV) conversion small molecule, Coumarin 153 (C153), is judiciously introduced into perovskite precursor to effectively enhance device efficiency and operational stability against UV radiation. It is found that the uncoordinated Pb2+ and A‐site vacancies of perovskite can be successfully fixed through Lewis acid–base coordination and hydrogen bonding upon C153 treatment, resulting in a stabilized structure with remarkably reduced intrinsic defects. Concurrently, the incremental visible light absorption derived from the down‐conversion effect of C153 molecules together with the optimized energy level arrangement contribute to the substantially enhanced photocurrent of the device. As a result, the resultant device delivers a champion efficiency of 24.73%, accompanied by greatly improved operational stability against environments, with retaining over 90% of initial PCE for ≈380, ≈1400, and 1710 h aging under continuous UV radiation, heating stress, and illumination, respectively. This work provides an effective and feasible strategy toward high‐efficiency and environment‐stable PSCs. [ABSTRACT FROM AUTHOR]
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- 2024
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6. Synergistic Full‐Scale Defect Passivation Enables High‐Efficiency and Stable Perovskite Solar Cells.
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Wen, Haoxin, Zhang, Zhen, Guo, Yixuan, Luo, Wenqiang, Si, Shenglin, Yin, Tianzhou, Wu, Hualin, and Huang, Shaoming
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SOLAR cells ,CRYSTAL grain boundaries ,IONIC liquids ,PRODUCTION sharing contracts (Oil & gas) - Abstract
Despite remarkable progress in perovskite solar cells (PSCs), the unsatisfying stability strongly interrelated with the defect density remains the main obstacle for commercialization. Herein, a synergetic defect passivation method is judiciously designed that consists of a precursor engineering strategy based on an ionic liquid 1‐butylsulfonate‐3‐methylimidazolium dihydrogen phosphate (BMDP), and two‐stage annealing (TSA) treatment to sufficiently passivate defects and enhance performance further. It is found that the multifunctional groups from BMDP have strong chemical interactions and form chelated complexes with perovskite components thus effectively passivating the intrinsic defects. Synergized by the sequential TSA treatment, the formed hydrophobic complexes can be precisely controlled with filling along grain boundaries (GBs) and on surfaces, leading to a wrapping of perovskite grains and significant passivation of GBs. Consequently, both deep‐ and shallow‐level defects in the bulk, at GBs and surface are sufficiently passivated, resulting in a champion efficiency of 24.20%. Impressively, the resultant unencapsulated films and corresponding devices exhibit admirable stability with maintaining 83.9% of initial composition for 4000 h of aging in moist air, 81.7% original structure after continuous heating for 1600 h, and 97% initial power conversion efficiency for 1000 h under continuous illumination. This work provides an efficient strategy toward improved efficiency and stability PSCs. [ABSTRACT FROM AUTHOR]
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- 2023
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7. Experimental study on fall velocity of fine sediment in the Yangtze Estuary, China
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Wan, Yuanyang, Wu, Hualin, Roelvink, Dano, and Gu, Fengfeng
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- 2015
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8. Dual Functions of Defect Passivation and Hole Transport Dopant Enabled by Piperidyl Ionic Liquid for Stable and Efficient Perovskite Solar Cells.
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Zhang, Zhen, Si, Shenglin, Luo, Wenqiang, Liang, Yunqi, Xian, Zihao, Wen, Haoxin, Huang, Xinxing, Yin, Tianzhou, Guo, Yixuan, Wu, Hualin, Xu, Yong, and Huang, Shaoming
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SOLAR cells ,PEROVSKITE ,PASSIVATION ,IONIC liquids ,DOPING agents (Chemistry) - Abstract
Perovskite solar cells (PSCs) have recently attracted rapid interest for harvesting solar energy. However, the defects in perovskite absorber and vulnerability of charge‐transporting layer lead to unsatisfying stability, which limits their practical applications. Herein, we demonstrate that the addition of a piperidyl ionic liquid, that is, 1‐butyl‐1‐methylpiperidinium bis(trifluoromethyl sulfonyl)imide ([BMP]+[TFSI]−), can serve as a dual functional additive for passivating the intrinsic defects in perovskite and simultaneously improving the hydrophobicity of hole transport layer. Consequently, the power conversion efficiency for the optimal planar PSCs significantly increases from 21.07% to 23.34%. Impressively, the unencapsulated champion cells display promising stability with a reservation over 80% of the initial efficiency after exposure to moisture air (65% ± 5% relative humidity) for 1600 h. This work provides a facile strategy toward enhancing the efficiency and stability of PSCs. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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9. Optical fiber ammonia sensor based on porous Yb3+/Er3+ co-doped NaYF4/phenol red composites.
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Li, Bangxing, Zhang, Xianming, Wu, Hualin, Zhao, Ying, Leng, Xuefeng, Jin, Ye, and Huang, Xinyue
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OPTICAL fiber detectors ,FIBER optical sensors ,AMMONIA ,DOPING agents (Chemistry) ,ERBIUM compounds ,OPTICAL fibers ,POLYVINYLIDENE fluoride ,VISIBLE spectra - Abstract
In this paper, the optical fiber ammonia sensor based on porous Yb
3+ /Er3+ co-doped NaYF4 up-conversion material/phenol red composites and optical fiber with end plane fusion sphere was proposed. Phenol red and Yb3+ /Er3+ co-doped NaYF4 were mixed thoroughly and fixed stably in the polyvinylidene fluoride (PVDF) matrix. The optical fiber with end plane fusion sphere was inserted into the sensitive composite material to form ammonia sensitive probe. The ammonia concentration will affect the intensity of absorption of up-conversion luminescence located at 545 nm by phenol red because of the reaction between ammonia and phenol red. The detected intensity of up-conversion luminescence near 545 nm decreases with the increasing ammonia concentration. The signal wavelength will not be affected by the background visible light due to the 980 nm wavelength of excitation is far from the signal wavelength. The response time and recover time also were measured and discussed. [ABSTRACT FROM AUTHOR]- Published
- 2022
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10. Interpretation of Rubidium‐Based Perovskite Recipes toward Electronic Passivation and Ion‐Diffusion Mitigation.
- Author
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Xu, Chenzhe, Chen, Xiwen, Ma, Shuangfei, Shi, Mingyue, Zhang, Suicai, Xiong, Zhaozhao, Fan, Wenqiang, Si, Haonan, Wu, Hualin, Zhang, Zheng, Liao, Qingliang, Yin, Wanjian, Kang, Zhuo, and Zhang, Yue
- Published
- 2022
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11. Dual function of clock component OsLHY sets critical day length for photoperiodic flowering in rice.
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Sun, Changhui, Zhang, Kuan, Zhou, Yi, Xiang, Lin, He, Changcai, Zhong, Chao, Li, Ke, Wang, Qiuxia, Yang, Chuanpeng, Wang, Qian, Chen, Congping, Chen, Dan, Wang, Yang, Liu, Chuanqiang, Yang, Bin, Wu, Hualin, Chen, Xiaoqiong, Li, Weitao, Wang, Jing, and Xu, Peizhou
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COMPLEMENTATION (Genetics) ,FLOWERING time ,RICE ,FLOWERS ,TRANSCRIPTOMES ,CIRCADIAN rhythms - Abstract
Summary: Circadian clock, an endogenous time‐setting mechanism, allows plants to adapt to unstable photoperiod conditions and induces flowering with proper timing. In Arabidopsis, the central clock oscillator was formed by a series of interlocked transcriptional feedback loops, but little is known in rice so far. By MutMap technique, we identified the candidate gene OsLHY from a later flowering mutant lem1 and further confirmed it through genetic complementation, RNA interference knockdown, and CRISPR/Cas9‐knockout. Global transcriptome profiling and expression analyses revealed that OsLHY might be a vital circadian rhythm component. Interestingly, oslhy flowered later under ≥12 h day length but headed earlier under ≤11 h day length. qRT‐PCR results exhibited that OsLHY might function through OsGI‐Hd1 pathway. Subsequent one‐hybrid assays in yeast, DNA affinity purification qPCR, and electrophoretic mobility shift assays confirmed OsLHY could directly bind to the CBS element in OsGI promoter. Moreover, the critical day length (CDL) for function reversal of OsLHY in oslhy (11–12 h) was prolonged in the double mutant oslhy osgi (about 13.5 h), indicating that the CDL set by OsLHY was OsGI dependent. Additionally, the dual function of OsLHY entirely relied on Hd1, as the double mutant oslhy hd1 showed the same heading date with hd1 under about 11.5, 13.5, and 14 h day lengths. Together, OsLHY could fine‐tune the CDL by directly regulating OsGI, and Hd1 acts as the final effector of CDL downstream of OsLHY. Our study illustrates a new regulatory mechanism between the circadian clock and photoperiodic flowering. [ABSTRACT FROM AUTHOR]
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- 2021
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12. Facile one-pot synthesis of Mg-doped g-C3N4 for photocatalytic reduction of CO2.
- Author
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Dong, Xinyue, Zhang, Suicai, Wu, Hualin, Kang, Zhuo, and Wang, Li
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- 2019
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13. Hierarchically distributed microstructure design of haptic sensors for personalized fingertip mechanosensational manipulation.
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Liao, Xinqin, Wang, Wensong, Lin, Maohua, Li, Minghua, Wu, Hualin, and Zheng, Yuanjin
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- 2018
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14. Interfacial Charge Behavior Modulation in Perovskite Quantum Dot-Monolayer MoS2 0D-2D Mixed-Dimensional van der Waals Heterostructures.
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Wu, Hualin, Kang, Zhuo, Zhang, Zihan, Zhang, Zheng, Si, Haonan, Liao, Qingliang, Zhang, Suicai, Wu, Jing, Zhang, Xiankun, and Zhang, Yue
- Subjects
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MOLYBDENUM sulfides , *PEROVSKITE , *MONOMOLECULAR films , *QUANTUM dots , *PHOTOLUMINESCENCE - Abstract
Fundamental understanding of charge behavior inside heterostructures is of vital importance for advancing high-performance optoelectronic applications. However, the charge behavior of 0D-2D mixed-dimensional van der Waals heterostructures (MvdWHs) in the photoexcited state remains elusive. In this work, an energy band alignment protocol is adopted to realize effective energy band structure engineering inside 0D-2D MvdWHs of perovskite quantum dots and MoS2 monolayer with precisely designed typical type I and type II heterostructures, respectively. A profile and in-depth understanding of interfacial photoinduced charge behavior is determined from two opposite perspectives based on MvdWHs. Sufficient comparison of a series of optical characterization results, including Raman shift, quenched photoluminescence, visualized suppressed fluorescence intensity, and shortened fluorescence lifetime imaging, clearly verifies that interfacial charge behavior can be tailored by varying the band alignment in 0D-2D MvdWHs. Furthermore, the photoresponse performance and the relatively stronger and weaker photogating effects of such MvdWH-based phototransistors also demonstrate modulation of interfacial charge behavior in 0D-2D MvdWHs via energy band structure engineering, which is still feasible for optoelectronic performance optimization. These results are expected to shed light on designing novel functional devices and advancing the development process of 0D-2D MvdWHs in the foreseeable future. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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- View/download PDF
15. Tuning Transport and Photoelectric Performance of Monolayer MoS2 Device by E‐Beam Irradiation.
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Li, Feng, Gao, Fei, Xu, Minxuan, Liu, Xinxin, Zhang, Xiankun, Wu, Hualin, and Qi, Junjie
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SCANNING electron microscopy ,ELECTRON beams ,PHOTOELECTRON spectroscopy ,OPTOELECTRONIC devices ,ELECTRON mobility - Abstract
Abstract: Here, the effect of E‐beam irradiation on the transport properties of the monolayer MoS
2 is investigated in situ using scanning electron microscope (SEM). The results show that the source drain current is increased under E‐beam irradiation; the current gradually increases to a saturation value with an increase in irradiation time, and the saturation value increases with an increase in E‐beam intensity. After E‐beam irradiation, X‐ray photoelectron spectroscopy (XPS) results show that the stoichiometry of MoS2 is modified, while the Raman and PL results reveal that the optical performance of the monolayer MoS2 is not deteriorated. The source–drain current and electron mobility of the MoS2 transistor are reduced by E‐beam irradiation, while the on–off current ratio of the transistor almost unchanges. However, the photoresponse performance, such as the light dark current ratio, response, and release speed of the device are improved. The results are discussed by the creation of defects which vary the injected and trapped charges of the sample by E‐beam irradiation. The results provide a new method to improve the optoelectronic performance of two dimensional (2D) materials devices. [ABSTRACT FROM AUTHOR]- Published
- 2018
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16. Ferroelectric polarization-enhanced charge separation in a vanadium-doped ZnO photoelectrochemical system.
- Author
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Liu, Yichong, Kang, Zhuo, Zhang, Suicai, Li, Yong, Wu, Hualin, Wu, Jing, Wu, Pingwei, Zhang, Zheng, Liao, Qingliang, and Zhang, Yue
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- 2018
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17. A High‐Performance Self‐Powered Photodetector Based on Monolayer MoS2/Perovskite Heterostructures.
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Bai, Fan, Qi, Junjie, Li, Feng, Fang, Youyin, Han, Weipeng, Wu, Hualin, and Zhang, Yue
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PHOTODETECTORS ,HETEROJUNCTIONS ,HETEROSTRUCTURES ,PEROVSKITE ,OPTICAL microscopes - Abstract
Abstract: Here, it is first reported that a self‐powered photodetector based on a MoS
2 /CH3 NH3 PbI3 vertical type heterojunction, which has responsivity of 60 mAW−1 and response/recovery time of 2149/899 ms. Under bias, it exhibits a photoswitching ratio exceeding 1522, fast response/recovery time of 205/206 ms, and high photoresponsivity of 68.11 AW−1 . The optoelectronic performances of the photodetector are closely related to the type of the MoS2 /CH3 NH3 PbI3 heterojunction, which acts as a hole (electron) transport field and can effectively decrease the recombination of holes and electrons. Additionally, the MoS2 /CH3 NH3 PbI3 planar type heterojunction is also built to compare with the vertical type in optoelectronics behavior. Due to the existence of internal field, the properties of vertical type photodetector are better than those of the planar type which also presents good performance with on/off ratio up to 1476, photoresponsivity of 28 AW−1 , and response rate of 356/204 ms. These results pave a new way to form an ultrahigh performance MoS2 /CH3 NH3 PbI3 heterojunction, hold the promise for construction of a self‐powered photodetector, and develop promising atomically thin MoS2 heterostructure device for photovoltaic and optoelectronic applications. [ABSTRACT FROM AUTHOR]- Published
- 2018
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18. Flexible and Highly Sensitive Strain Sensors Fabricated by Pencil Drawn for Wearable Monitor.
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Liao, Xinqin, Liao, Qingliang, Yan, Xiaoqin, Liang, Qijie, Si, Haonan, Li, Minghua, Wu, Hualin, Cao, Shiyao, and Zhang, Yue
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STRUCTURAL health monitoring ,ROBOTICS ,STRAIN sensors ,SUSTAINABLE chemistry ,GRAPHITE - Abstract
Functional electrical devices have promising potentials in structural health monitoring system, human-friendly wearable interactive system, smart robotics, and even future multifunctional intelligent room. Here, a low-cost fabrication strategy to efficiently construct highly sensitive graphite-based strain sensors by pencil-trace drawn on flexible printing papers is reported. The strain sensors can be operated at only two batteries voltage of 3 V, and can be applied to variously monitoring microstructural changes and human motions with fast response/relaxation times of 110 ms, a high gauge factor (GF) of 536.6, and high stability >10 000 bending-unbending cycles. Through investigation of service behaviors of the sensors, it is found that the microcracks occur on the surface of the pencil-trace and have a major influence on the functions of the strain sensors. These performances of the strain sensor attain and even surpass the properties of recent strain sensing devices with subtle design of materials and device architectures. The pen-on-paper (PoP) approach may further develop portable, environmentally friendly, and economical lab-on-paper applications and offer a valuable method to fabricate other multifunctional devices. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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19. Online assessment of pear firmness by acoustic vibration analysis.
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Ding, Chengqiao, Wu, Hualin, Feng, Zhe, Wang, Dachen, Li, Weihao, and Cui, Di
- Subjects
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ACOUSTIC vibrations , *LASER Doppler vibrometer , *PEARS , *REGRESSION analysis , *BACK propagation , *FRUIT ripening , *FRUIT trees - Abstract
• Develop an online system for firmness detection. • Determine predominant components of cell wall in softening process of 'Cuiguan' pear. • Select optimal firmness index by sensory evaluation and compositional analysis. • Achieve prediction of pear firmness based on different multivariate statistical methods. Firmness is an important quality indicator of fruit and is closely related to physical structures and mechanical properties. In this study, an online detection system using a laser Doppler vibrometer (LDV) was developed to acquire the acoustic vibration response signals of 'Cuiguan' pears for firmness detection. Based on compositional analysis of pear tissue, the predominant components in the process of fruit softening were crude fiber and pectin. Subsequently, different classification models for prediction of pear firmness were established based on sensory evaluation. The results showed that a back propagation neural network (BPNN) method using the elasticity index (EI), peak value at f 2 (A) and peak area (S) as input variables had the highest discriminant accuracy. The accuracies of the calibration and validation sets were 93.3 % and 90.5 %, respectively. Moreover, the stiffness in the peeled group obtained by a puncture test was regarded as a dependent variable in quantitative analysis due to its high correlation coefficients with sensory scores and chemical indices in postharvest. In addition, multiple regression models were compared with simple linear regression models. The highest correlation coefficient r p of the prediction set was observed for the BPNN model. In addition, the BPNN method using EI , A , S and the shape index had the best prediction performance. The correlation coefficient r p and RMSEP of the prediction set were 0.832 and 0.277 N mm−1, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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20. Perovskite Crystallization: A‐Site Management for Highly Crystalline Perovskites (Adv. Mater. 4/2020).
- Author
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Si, Haonan, Zhang, Zheng, Liao, Qingliang, Zhang, Guangjie, Ou, Yang, Zhang, Suicai, Wu, Hualin, Wu, Jing, Kang, Zhuo, and Zhang, Yue
- Published
- 2020
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21. A‐Site Management for Highly Crystalline Perovskites.
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Si, Haonan, Zhang, Zheng, Liao, Qingliang, Zhang, Guangjie, Ou, Yang, Zhang, Suicai, Wu, Hualin, Wu, Jing, Kang, Zhuo, and Zhang, Yue
- Published
- 2020
- Full Text
- View/download PDF
22. Ligand Engineering for Improved All‐Inorganic Perovskite Quantum Dot‐MoS2 Monolayer Mixed Dimensional van der Waals Phototransistor.
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Wu, Hualin, Kang, Zhuo, Zhang, Zihan, Si, Haonan, Zhang, Suicai, Zhang, Zheng, Liao, Qingliang, and Zhang, Yue
- Subjects
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SURFACE passivation , *PHOTOTRANSISTORS , *PEROVSKITE , *QUANTUM dots , *CHARGE transfer , *QUANTUM dot synthesis - Abstract
Combining intriguing physical properties of 2D crystals and intrinsically remarkable optical properties of halide perovskite quantum dots (QDs), the 0D–2D perovskite QD–based mixed dimensional van der Waals heterostructure (MvdWH) is considered as promising for optoelectronic applications. Even though the interfacial electronic structure of MvdWHs is sufficiently engineered to manipulate the charge carrier behavior, the issue of interfacial charge transfer efficiency originating from the residue ligands that are inevitably introduced by the QDs is still prominently remained. From this perspective, for the first time, a solution‐processed surface ligand density control strategy is demonstrated to balance the QD surface passivation and the interfacial charge carrier extraction and injection efficiency in the 0D–2D MvdWH system. The accurate adjustment of ligand density outside QDs enables the subsequent modulation on interfacial charge carrier transfer efficiency from the aspect of electronic and optoelectronic properties. Furthermore, such kind of ligand engineering toward MvdWH interface is substantially demonstrated in a photogating mechanism–based phototransistor with an improved photoresponsivity as high as 1.13 × 105 A W−1. These results may push forward the evolution of 0D–2D mixed dimensional van der Waals optoelectronics. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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- View/download PDF
23. All‐Inorganic Perovskite Quantum Dot‐Monolayer MoS2 Mixed‐Dimensional van der Waals Heterostructure for Ultrasensitive Photodetector.
- Author
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Wu, Hualin, Si, Haonan, Zhang, Zihan, Kang, Zhuo, Wu, Pingwei, Zhou, Lixin, Zhang, Suicai, Zhang, Zheng, Liao, Qingliang, and Zhang, Yue
- Abstract
2D transition metal dichalcogenide (2D‐TMD) materials and their van der Waals heterostructures (vdWHs) have inspired worldwide efforts in the fields of electronics and optoelectronics. However, photodetectors based on 2D/2D vdWHs suffer from performance limitations due to the weak optical absorption of their atomically thin nature. In this work, taking advantage of an excellent light absorption coefficient, low‐temperature solution‐processability, and long charge carrier diffusion length, all‐inorganic halides perovskite CsPbI3−xBrx quantum dots are integrated with monolayer MoS2 for high‐performance and low‐cost photodetectors. A favorable energy band alignment facilitating interfacial photocarrier separation and efficient carrier injection into the MoS2 layer inside the 0D–2D mixed‐dimensional vdWHs are confirmed by a series of optical characterizations. Owing to the synergistic effect of the photogating mechanism and the modulation of Schottky barriers, the corresponding phototransistor exhibits a high photoresponsivity of 7.7 × 104 A W−1, a specific detectivity of ≈5.6 × 1011 Jones, and an external quantum efficiency exceeding 107%. The demonstration of such 0D–2D mixed‐dimensional heterostructures proposed here would open up a wide realm of opportunities for designing low‐cost, flexible transparent, and high‐performance optoelectronics. All‐inorganic perovskite quantum dots are integrated with monolayer MoS2 for a high‐performance and low‐cost photodetector. Owing to the synergistic effect of the photogating mechanism and Schottky barriers modulation, this type‐II band alignment 0D–2D mixed‐dimensional van der Waals heterostructured phototransistor exhibits a high photoresponsivity of 7.7 × 104 A W−1, a specific detectivity of ≈5.6 × 1011 Jones, and an external quantum efficiency exceeding 107%. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
24. Sequencing and analysis of the complete mitochondrial genome of tundra shrew ( Sorex tundrensis ) from China.
- Author
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Xu, Chunzhu, Zhao, Shuai, Wu, Hualin, Wu, Shengyang, Zhang, Zhongwen, Wang, Bo, and Dou, Huashan
- Subjects
SHREWS ,MITOCHONDRIAL DNA ,SOREX ,NUCLEOTIDE sequencing ,TRANSFER RNA ,RIBOSOMAL RNA ,PHYLOGENY ,MAMMALS - Abstract
The complete mitogenome sequence of tundra shrew (Sorex tundrensis) was determined using long PCR. The genome was 17,444 bp in length and contained 13 protein-coding genes, 2 ribosomal RNA genes, 23 transfer RNA genes, 1 origin of L strand replication and 1 control region. The overall base composition of the heavy strand is A (32.9%), C (24.8%), T (29.0%), and G (13.3%). The base compositions present clearly the A–T skew, which is most obviously in the control region and protein-coding genes. The extended termination-associated sequence domain, the central conserved domain and the conserved sequence block domain are defined in the mitochondrial genome control region of tundra shrew. Mitochondrial genome analyses based on MP, ML, NJ and Bayesian analyses yielded identical phylogenetic trees. The threeSorexspecies formed a monophyletic group with the high bootstrap value (100 %) in all examinations. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
25. Hydrodynamic evolutions at the Yangtze Estuary from 1998 to 2009.
- Author
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Wan, Yuanyang, Gu, Fengfeng, Wu, Hualin, and Roelvink, Dano
- Subjects
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HYDRODYNAMICS , *WATERWAYS , *NATURAL resources , *HARBORS , *HYDRAULIC structures , *MARITIME shipping - Abstract
Over the past decade, the Yangtze Estuary has witnessed an unprecedented scale of human interventions and modifications through extensively varied resource utilizations. During the processes, mankind has obtained various resources and benefits via the "golden waterway", such as navigation channel, harbor, shipping industry, shoreline, reclaimed land, freshwater and fishery resource. At the same time, the estuary and coast have also experienced a series of gradual changes in characteristics, such as sedimentation, erosion, sand hungry, water pollution, intertidal area loss, self-purification capacity decrease, and biological reduction. With the help of measurement data and numerical modeling, this study analyzed the response and feedback mechanisms between hydrodynamic evolutions and morphological processes in the Yangtze Estuary from 1998 to 2009. The results of this study indicate the following. (i) The water level along the main outlet of the Yangtze Estuary increased from 1998 to 2009. This increase was induced by the variation of the whole river regime (including natural geomorphodynamic process and local topography feedbacks from extreme metrological events and human activities). (ii) The decrease of the flow partition ratio at the 3rd bifurcation is directly induced by the Deepwater Navigational Channel (DNC) project and the corresponding morphological changes in the North Passage. (iii) The estuarine environmental gradients (salinity and suspended sediment concentration) were compressed, and the fresh-salt gradient became steeper. This has the indirect effect of backfilling in the waterway, i.e., strengthening the stratification effect near the ETM area and enhancing the tendency of up-estuary sediment transport. The results of this study give insights into explaining other phenomena such as deposition in the middle reach of the DNC, bathymetry evolutions, variations in vertical velocity and sediment concentration profiles, waterway backfilling and delta reclamation. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
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