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878 results on '"Zhang, Qisheng"'

201. Selection of side groups on simple non‐fullereneacceptors for the application in organic solar cells: From flexible to rigid

Author

Ye, Shounuan, Chen, Shuaishuai, Zheng, Xiangjun, Li, Shuixing, Pan, Youwen, Chen, Yiyao, Fang, Jin, Ma, Changqi, Wang, Dan, Zhang, Qisheng, Shi, Minmin, and Chen, Hongzheng

Abstract

The side chains on non‐fullerene acceptors (NFAs) can affect greatly the photovoltaic performances of the resulting organic solar cells (OSCs) by regulating the molecular packing and orientation of NFAs. To explore suitable side groups for asymmetric simple NFAs, in this work, we design and synthesize two A‐D1‐A′‐D2‐A type NFAs, NTC‐4Cl, and PhNTC‐4Cl, which own flexible alkyloxy and rigid aryloxy side chains on the A′ cores, respectively. Due to the same molecular backbone (A′: benzotriazole; D1: thiophene; D2: cyclopentadithiophene; A: dichlorodicyanoindanone), NTC‐4Cl and PhNTC‐4Cl have similar absorptions and energy levels. However, the PhNTC‐4Cl‐based OSC gives a higher power conversion efficiency than that of the NTC‐4Cl‐based one (11.09% vs. 10.82%) because PhNTC‐4Cl shows more compact π–π stacking and dominant face‐on orientation, enhancing charge transport and mitigating charge recombination. Therefore, this work provides a new insight into the molecular design of high‐performance NFAs, especially the rational choice of side groups on asymmetric simple NFAs.

Published
2022
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203. Recapitulation of SARS-CoV-2 Infection and Cholangiocyte Damage with Human Liver Organoids

Author

Zhao, Bing, primary, Ni, Chao, additional, Gao, Ran, additional, Wang, Yuyan, additional, Yang, Li, additional, Wei, Jinsong, additional, Lv, Ting, additional, Liang, Jianqing, additional, Zhang, Qisheng, additional, Xu, Wei, additional, Xie, Youhua, additional, Wang, Xiaoyue, additional, Yuan, Zhenghong, additional, Liang, Junbo, additional, Zhang, Rong, additional, and Lin, Xinhua, additional

Published
2020
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204. Quantitative Design of Bright Fluorophores and AIEgens by the Accurate Prediction of Twisted Intramolecular Charge Transfer (TICT)

Author

Wang, Chao, primary, Qiao, Qinglong, additional, Chi, Weijie, additional, Chen, Jie, additional, Liu, Wenjuan, additional, Tan, Davin, additional, McKechnie, Scott, additional, Lyu, Da, additional, Jiang, Xiao‐Fang, additional, Zhou, Wei, additional, Xu, Ning, additional, Zhang, Qisheng, additional, Xu, Zhaochao, additional, and Liu, Xiaogang, additional

Published
2020
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215. Tetradentate Platinum(II) Complexes for Highly Efficient Phosphorescent Emitters and Sky Blue OLEDs

Author

Li, Guijie, primary, Zhao, Xiangdong, additional, Fleetham, Tyler, additional, Chen, Qidong, additional, Zhan, Feng, additional, Zheng, Jianbing, additional, Yang, Yun-Fang, additional, Lou, Weiwei, additional, Yang, Yuning, additional, Fang, Kun, additional, Shao, Zongzhou, additional, Zhang, Qisheng, additional, and She, Yuanbin, additional

Published
2019
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238. Flexibility Calculation of Like-U Type Flexure Hinge

Author

Zhang Qisheng, Li Ruiqin, and Ling Jingjing

Subjects
Physics::Computational Physics, business.industry, Mechanical Engineering, Computation, Hinge, Base (geometry), Structure (category theory), Structural engineering, Type (model theory), Physics::Classical Physics, Finite element method, Computer Science::Other, Castigliano's method, business, Mathematics, Variable (mathematics)
Abstract

A new like-U type flexure hinge structure is proposed, based on Castigliano’s second theorem and calculus theory. Taking the centrifugal angle parameters as the integration variable, and defining the intermediate parameters, it deduces the analytic computational formula for the like-U type flexure hinge flexibility. By changing the structural parameter of the flexure hinge, it is able to transform four different structure flexure hinges, and the deduced analytic computation formula can be applied to all of these four structures flexure hinges. After the twelve flexure hinges of different structures have been analyzed by applying finite-element method, it is found that the results are in good agreement with the results of analytic computation formula. Thus, the validity of the analytic computation formula is verified, realize accurate design and computation for such flexure hinges is realized, and the theoretical base for technical application of like-U type flexure hinge is provided.

Published
2015
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240. Clear colonoscopy as a surveillance tool in the prediction and reduction of advanced neoplasms: a randomized controlled trial.

Author

Zhang, Qisheng, Shen, Yucui, Xu, Jianhua, Gao, Peng, Bing, and Han

Subjects
*RANDOMIZED controlled trials, *COLONOSCOPY, *TUMORS
Abstract

Background: Missed and incompletely resected lesions remain the main cause of the recurrence of advanced neoplasms (ANs) in post-polypectomy patients. This study aims to determine whether the recurrence of ANs can be predicted and reduced by the newly developed clear colonoscopy procedure. Methods: Between 2006 and 2010, a total of 1350 participants with colorectal neoplasm were equally randomized to clear colonoscopy surveillance (CCS) and routine colonoscopy surveillance (RCS) in our center. Clear colonoscopy was achieved through repeat colonoscopy. On surveillance colonoscopy at 3 (for high-risk patients) and 5 (for low-risk patients) years, the recurrence of ANs and the relationship between the frequency of repeat examinations required for a clear colonoscopy and the recurrence of ANs were analyzed. Results: Surveillance colonoscopy at 3 and 5 years showed that the incidence of ANs in patients belonging to the CCS group was 1.7%, which was lower than 4.7% in patients belonging to the RCS group (P = 0.012) for both high- and low-risk patients. Out of the 1126 patients who achieved clear colonoscopy on first repeat examination, only 5 (0.4%) were found to have ANs on surveillance examination, whereas 12 out of the 217 (5.4%) patients on second repeat examination and 5 out of the 29 (17.2%) patients on third repeat examination were found to have ANs (P < 0.001). Conclusion: Surveillance based on clear colonoscopy decreased the incidence of ANs in post-polypectomy patients. The number of repeat examinations required for a clear colonoscopy is an important factor in the prediction of the recurrence of ANs. [ABSTRACT FROM AUTHOR]

Published
2021
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241. Thermally activated delayed fluorescence (TADF) organic molecules for efficient X-ray scintillation and imaging

Author

Ma, Wenbo, Su, Yirong, Zhang, Qisheng, Deng, Chao, Pasquali, Luca, Zhu, Wenjuan, Tian, Yue, Ran, Peng, Chen, Zeng, Yang, Gaoyuan, Liang, Guijie, Liu, Tianyu, Zhu, Haiming, Huang, Peng, Zhong, Haizheng, Wang, Kangwei, Peng, Shaoqian, Xia, Jianlong, Liu, Huafeng, Liu, Xu, and Yang, Yang Michael

Abstract

X-ray detection, which plays an important role in medical and industrial fields, usually relies on inorganic scintillators to convert X-rays to visible photons; although several high-quantum-yield fluorescent molecules have been tested as scintillators, they are generally less efficient. High-energy radiation can ionize molecules and create secondary electrons and ions. As a result, a high fraction of triplet states is generated, which act as scintillation loss channels. Here we found that X-ray-induced triplet excitons can be exploited for emission through very rapid, thermally activated up-conversion. We report scintillators based on three thermally activated delayed fluorescence molecules with different emission bands, which showed significantly higher efficiency than conventional anthracene-based scintillators. X-ray imaging with 16.6 line pairs mm−1resolution was also demonstrated. These results highlight the importance of efficient and prompt harvesting of triplet excitons for efficient X-ray scintillation and radiation detection.

Published
2022
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242. Observation and research of deep underground multi-physical fields—Huainan −848 m deep experiment

Author

Wang, Yun, Yang, Yaxin, Sun, Heping, Xie, Chengliang, Zhang, Qisheng, Cui, Xiaoming, Chen, Chang, He, Yongsheng, Miao, Qiangqiang, Mu, Chaomin, Guo, Lianghui, and Teng, Jiwen

Abstract

Compared with the surface, the deep environment has the advantages of allowing “super-quiet and ultra-clean”-geophysical field observation with low vibration noise and little electromagnetic interference, which are conducive to therealization of long-term and high-precision observation of multi-physical fields, thus enabling the solution of a series of geoscience problems. In the Panyidong Coal Mine, where there are extensive underground tunnels at the depth of 848 m belowsea level, we carried out the first deep-underground geophysical observations, including radioactivity, gravity, magnetic, magne-totelluric, background vibration and six-component seismic observations. We concluded from these measurements that (1) the background of deep subsurface gravity noise in the long-period frequency band less than 2 Hz is nearly two orders ofmagnitude weaker than that in the surface observation environment; (2) the underground electric field is obviously weaker thanthe surface electric field, and the relatively high frequency of the underground field, greater than 1 Hz, is more than two orders of magnitude weaker than that of the surface electric field; the east-west magnetic field underground is approximately the same asthat at the surface; the relatively high-frequency north-south magnetic field underground, below 10 Hz, is at least one order ofmagnitude lower than that at the surface, showing that the underground has a clean electromagnetic environment; (3) in additionto the high-frequency and single-frequency noises introduced by underground human activities, the deep underground spacehas a sig-nificantly lower background vibration noise than the surface, which is very beneficial to the detection of weakearthquake and gravity signals; and (4) the underground roadway support system built with ferromagnetic material interferesthe geomagnetic field. We also found that for deep observation in the “ultra-quiet and ultra-clean” environment, the existinggeophysical equipment and observation technology have problems of poor adaptability and insufficient precision as well asdata cleaning problems, such as the effective separation of the signal and noise of deep observation data. It is also urgent tointerpret and comprehensively utilize these high-precision multi-physics observation data.

Published
2022
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243. Research on Hub-and-Spoke Transportation Network of China Railway Express.

Author

Tang, Yinying, Chen, Si, Lu, Guangyu, and Zhang, Qisheng

Subjects
JOINT use of railroad facilities, HEURISTIC algorithms, RAILROADS, TRANSSHIPMENT
Abstract

China Railway Express is developing rapidly, but the point-to-point direct organization mode has brought many problems to it. Therefore, this paper proposes to construct a hub-and-spoke network and adopt the "collecting and transportation" organization mode. In this paper, based on the single distribution p-hub median problem, a dual-objective planning model was constructed by considering the characteristics of CR Express in terms of cost and time. In addition, considering the port as a key node of international rail transport network, it plays a vital role for CR Express. Therefore, a hub-port allocation model was constructed to determine the hub-port allocation relationship. Furthermore, a Lagrangian relaxation heuristic algorithm was designed to solve the model built for CR Express transportation network. Finally, based on the constructed model, the actual operation data of CR Express were used in the designed example to verify the effectiveness and applicability of the models and methods. [ABSTRACT FROM AUTHOR]

Published
2021
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244. Effects of temperature on paocai bacterial succession revealed by culture-dependent and culture-independent methods

Author

Yao Tang, Wang Meng, Zhang Qisheng, Wang Dongdong, Shen Wenxi, Shuliang Liu, Wen Qin, Chen Gong, and Li Heng

Subjects
DNA, Bacterial, Hot Temperature, Weissella, Lactococcus, DNA, Ribosomal, Polymerase Chain Reaction, Microbiology, 03 medical and health sciences, Culture Techniques, RNA, Ribosomal, 16S, Lactobacillus, Leuconostoc, Food science, 030304 developmental biology, 0303 health sciences, biology, 030306 microbiology, Lactobacillus brevis, food and beverages, General Medicine, biology.organism_classification, Random Amplified Polymorphic DNA Technique, Cold Temperature, carbohydrates (lipids), Leuconostoc mesenteroides, Fermentation, Food Microbiology, Fermented Foods, Lactobacillus plantarum, Food Science
Abstract

Paocai is a widely consumed Chinese traditional fermented vegetable product. To understand the effect of temperature on paocai fermentation flora, the bacterial community structure of paocai fermented at 10 °C, 15 °C, 25 °C and 35 °C was analyzed by culture-dependent and culture-independent methods. The results showed that increasing the fermentation temperature in a certain range is beneficial for rapid paocai acid production and shortening of the maturity period. Illumina Miseq sequencing was performed on 56 samples at different fermentation process temperatures using a culture-independent method. A total of 1,964,231 high-quality reads of 16S rRNA V3-V4 regions were obtained, and they were divided into 405 operational taxonomic units (OTUs) and identified as 213 bacterial genera. The bacterial diversity decreased with the progression of fermentation, and some spoiled samples had an increased diversity. The culture-independent method found that at 10 °C, Lactococcus appeared at the start of fermentation, Leuconostoc and Weissella appeared in the middle of fermentation, and Lactobacillus and Leuconostoc dominated fermentation in the late stage. At 15 °C, Lactococcus started fermentation, Leuconostoc appeared in the middle stage, and Lactobacillus was dominant in the late stage. At 25 °C, Lactococcus started fermentation, Weissella and Lactobacillus appeared in the middle stage, and Lactobacillus dominated fermentation in the late stage. Finally, at 35 °C, Lactococcus, Weissella, and Lactobacillus started fermentation, Weissella and Lactobacillus appeared in the middle stage, and Lactobacillus dominated fermentation in the late stage. A total of 647 strains of bacteria were isolated by culture-dependent methods and were divided into 12 genera and 19 species by randomly amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR) and 16S ribosomal RNA gene (rDNA) sequencing technology. More types of bacteria were isolated in the early stage of fermentation. At 10 °C, Lactococcus lactis began fermentation, and Lactobacillus brevis and Leuconostoc mesenteroides dominated acid production in the middle and late stages of paocai fermentation. At 15 °C, L. lactis initiates fermentation, while Lactobacillus plantarum dominates the acid fermentation of paocai. At 25 °C and 35 °C, there were a large number of Enterobacteriaceae bacteria in the start-up fermentation stage, and L. plantarum was dominant after 1–2 days of fermentation. Redundancy analysis (RDA) found that the lower the temperature, the more bacterial species that are produced, and the higher the temperature and the longer the time, the more obvious are the effects of L. plantarum on paocai. The results of dominant bacteria studied by culture-dependent and culture-independent methods are similar. The results indicate that most of the dominant microorganisms in the paocai fermentation system are culturable. This discovery can provide data and physical support for modernization and regulation of different types of paocai production.

Published
2020
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