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306 results on '"Wei, Zhonglin"'

51. Design of Gas Turbine State Data Acquisition Instrument Based on EEMD

Author

Liu Pengyuan, Feng Wang, Wang Tianhui, and Wei Zhonglin

Subjects
Data acquisition, Computer science, law, Interface (computing), Real-time computing, Process (computing), Condition monitoring, State (computer science), USB, Fault detection and isolation, law.invention
Abstract

In order to carry out the condition monitoring tasks in working process of gas turbine, a multi-channels data acquisition instrument was designed based on high-speed AD and FPGA, which can collect temperature, rotational speed and vibration signals in real time. The data is transmitted to PC through USB interface, then PC uses EEMD to analysis the vibration data and LabVIEW software to process and display data. At the same time the instrument has both on-line data processing module and storage module, and it can analyze data offline in special working environment. The instrument is characterized by good communication ability with host computer and strong anti-interference ability, so it can provide reliable state data for fault detection and analysis of gas turbine, and it is feasible and practical to carry out data acquisition and condition monitoring in a complex environment.

Published
2020

52. Role of Adamantane Amide Based on L-Proline Double-H Potential Organocatalyst in Aldol Reaction with Product Separated via Host-guest Interaction

Author

Lin Yingjie, DU Jianshi, LI Yaoxian, Duan Haifeng, Feng Yusha, Guo Jing, Yang Qingbiao, Wang Rui, XU Enjie, and Wei Zhonglin

Subjects
Hydrogen, 010405 organic chemistry, Chemistry, Adamantane, chemistry.chemical_element, General Chemistry, 010402 general chemistry, 01 natural sciences, Toluene, 0104 chemical sciences, Catalysis, Chiral column chromatography, chemistry.chemical_compound, Aldol reaction, Amide, Organic chemistry, Proline
Abstract

Chiral organocatalysts of 4-adamantane amide based on L-proline with double hydrogen potential were synthesized and used in asymmetric aldol reactions. The reactions were evaluated in toluene under‒20 °C. A series of aldol products was obtained from moderate to good yields(up to 98%) with excellent diastereoselectivities(up to >99:1) and enantioselectivities(up to >99%). The aldol products in the system were separated by α-cyclodextrin via host-guest interaction and determined by chiral HPLC. The catalyst could be reused up to five times. The 4-substitution position played an important role in diastereoselectivity and enantioselectivity.

Published
2018

54. Chiral Urea-Catalyzed Asymmetric Mannich Reaction of 3-Fluorooxindoles with α-Amidosulfones: Synthesis of Optically Active α-Fluoro-β-amino-oxindoles.

Author

Zhang, Xin, Wei, Zhonglin, Cao, Jungang, Liang, Dapeng, Lin, Yingjie, and Duan, Haifeng

Subjects
*MANNICH reaction, *OXINDOLES, *QUININE, *UREA
Abstract

The asymmetric Mannich reaction of 3-fluorooxindoles and α-amidosulfones catalyzed by a chiral urea catalyst derived from quinine in presence of K3 PO4 was developed. Through the asymmetric reaction, a series of α-fluoro-β-amino-oxindoles, containing a tertiary carbon stereocenter, could be obtained in high yields (up to 95%) with high enantioselectivity (95%) and diastereoselectivity (>99:1). Such α-fluoro-β-amino-oxindole compounds are expected to become candidates in the field of medicine. [ABSTRACT FROM AUTHOR]

Published
2022
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55. Facile Preparation of Chitosan‐modified Mesoporous Titanium Dioxide Film on Fused‐silica Capillary for Selective Enrichment of Phosphopeptides.

Author

Lv, Xinyan, Jiao, Shihui, Cui, Lili, Wei, Zhonglin, Wang, Boran, Wang, Wenwen, Zhang, Qi, Tan, Yumei, Pang, Guangsheng, and Feng, Shouhua

Subjects
TITANIUM dioxide films, PHOSPHOPEPTIDES, TITANIUM dioxide, CAPILLARIES, ADSORPTION capacity
Abstract

Chitosan (Cts), a positively charged natural polysaccharide, is employed to functionalize mesoporous titanium dioxide (mTiO2) nanoparticles. The prepared Cts/mTiO2 composite was used as a stationary phase to coat the inner wall of fused‐silica capillary and obtain uniform Cts/mTiO2 film. The Cts/mTiO2 film is applied to detect and enrich phosphopeptides in complex biological samples based on typical in‐tube solid phase microextraction (IT‐SPME) system. This unique Cts/mTiO2 film exhibits excellent enrichment performances of high selectivity (β‐casein and BSA in molar ratio of 1 : 1000), sensitivity (detection limit as low as 40 fmol of β‐casein tryptic digest solution) and high adsorption capacity (124.5 μg mg−1). Meanwhile, the Cts/mTiO2 film possesses preferable reusability and can be reused more than 10 times. These results confirm that the Cts/mTiO2 film possesses potential and satisfactory prospects in phosphoproteomics analysis. [ABSTRACT FROM AUTHOR]

Published
2022
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62. Construction of highly fluorescent N–O seven-membered heterocycles thermo-oxidation of oxazolidines

Author

Chen, Qiaonan, Liang, Xiao, Du, Jiahui, Wei, Zhonglin, Zhang, Yu-Mo, Zhang, Ting, Qin, Tianyou, Gao, Wenbin, Sheng, Lan, and Zhang, Sean Xiao-An

Subjects
Materials science, education, technology, industry, and agriculture, 02 engineering and technology, General Chemistry, Conjugated system, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Combinatorial chemistry, Fluorescence, humanities, Planarity testing, 0104 chemical sciences, Nucleophile, Intramolecular force, Reagent, Materials Chemistry, Molecule, 0210 nano-technology, Structural rigidity
Abstract

A controllable heterocyclic construction method to obtain planar structures with multiple fluorescent colors and excellent fluorescence quantum yields., Nitrogen heterocycles are significant structural components for organic compounds and pharmaceuticals. A new class of photooxidation products of oxazolidines with seven-membered heterocycles were reported in our previous work. These photosynthesized molecules have great potential for attractive fluorescent materials due to their unusual conjugated structure and rigidity. However, the violent UV irradiation during synthesis results in many undesirable side-products, making the purification and scale-up of desirable products difficult. Herein, the desired N–O seven-membered heterocycles were quantitatively synthesized one-step thermo-oxidation using O /CH I, I or -iodosuccinimide (NIS) as an oxidant. The structures of these compounds were confirmed by single-crystal X-ray diffraction. During the thermal-oxidation process, intramolecular ionization generated a flexible –CH CH O group, which attacked the CC bond with the assistance of oxidants and subsequently led to the formation of the products. The formed seven-membered heterocycles exhibited remarkably enhanced fluorescence compared to the corresponding ring-open forms of oxazolidines, which possess more flexible conjugated substructures. In particular, the fluorescence quantum yields of some products reach 0.92 and 0.62 in the red emission region. Theoretical calculations suggest that the strong fluorescence originates from their unique structural rigidity and planarity and thus highly conjugated electron system. This work provides a new synthesis method for demanding medium-sized heterocycles with notably strong fluorescence. These new dyes have potential use as visible and fluorescent dual-mode colour inks, nucleophilic reagent response materials, and bio-label materials.

Published
2019
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64. Asymmetric Synthesis of 3-Phenyl-2,3-dihydro-1 H -pyrrolo[3,2- b ]pyridine-3-carbonitriles Catalyzed by Phase-Transfer Catalyst Derived from tert -Leucine.

Author

Zhao, Zhiqi, Wang, Jingdong, Wei, Zhonglin, Cao, Jungang, Liang, Dapeng, Duan, Haifeng, and Lin, Yingjie

Subjects
PHASE-transfer catalysts, ASYMMETRIC synthesis, MANNICH reaction, ENANTIOMERS
Abstract

Chiral phase-transfer catalysts derived from tert -leucine were synthesized and used in the asymmetric synthesis of 4-azaindoline derivatives. By this method, both enantiomers of the corresponding products were obtained in excellent yield (up to 99%) with high enantio-selectivities (up to 91% ee) and diastereoselectivities (up to >99: 1 dr). [ABSTRACT FROM AUTHOR]

Published
2021
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74. CF3SO2Na as a Bifunctional Reagent: Electrochemical Trifluoromethylation of Alkenes Accompanied by SO2 Insertion to Access Trifluoromethylated Cyclic N‐Sulfonylimines.

Author

Li, Zheng, Jiao, Lingcong, Sun, Yunhai, He, Zeying, Wei, Zhonglin, and Liao, Wei‐Wei

Subjects
ALKENES, SULFUR dioxide, CONSTRUCTION, FASHION, MATERIALS
Abstract

An unprecedented electrochemical trifluoromethylation/SO2 insertion/cyclization process has been achieved in an undivided cell in an atom‐economic fashion. The protocol relies on tandem cyclization of N‐cyanamide alkenes by using Langlois' reagent as a source of both CF3 and SO2 under direct anodically oxidative conditions, in which two C−C bonds, two C−X bonds (N−S and S−C), and two rings were formed in a single operation. This transformation enabled efficient construction of various trifluoromethylated cyclic N‐sulfonylimines from readily accessible materials. [ABSTRACT FROM AUTHOR]

Published
2020
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81. Research on decision-making in emotional agent based on reinforcement learning

Author

Jiang Kui, Wei Zhonglin, Chen Lin, Feng Chao, and Zhai Bing

Subjects
Error-driven learning, Computer science, Human intelligence, business.industry, 05 social sciences, ComputingMethodologies_ARTIFICIALINTELLIGENCE, 050105 experimental psychology, 03 medical and health sciences, 0302 clinical medicine, Work (electrical), Reinforcement learning, 0501 psychology and cognitive sciences, Artificial intelligence, business, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), 030217 neurology & neurosurgery
Abstract

Emotion is an important part of human intelligence. The absence of emotion in agent leads to poor effectiveness and adaptability. In our work, an architecture of emotional agent is presented. The agent based on this architecture uses reinforcement learning to make decisions. But the reward of behavior algorithm derives from agent's emotion and external world. Experiment shows that the emotional agent has quicker study rate and its behavior is more adaptable.

Published
2016

91. Construction of highly fluorescent N–O seven-membered heterocycles via thermo-oxidation of oxazolidines.

Author

Chen, Qiaonan, Liang, Xiao, Du, Jiahui, Wei, Zhonglin, Zhang, Yu-Mo, Zhang, Ting, Qin, Tianyou, Gao, Wenbin, Sheng, Lan, and Zhang, Sean Xiao-An

Abstract

Nitrogen heterocycles are significant structural components for organic compounds and pharmaceuticals. A new class of photooxidation products of oxazolidines with seven-membered heterocycles were reported in our previous work. These photosynthesized molecules have great potential for attractive fluorescent materials due to their unusual conjugated structure and rigidity. However, the violent UV irradiation during synthesis results in many undesirable side-products, making the purification and scale-up of desirable products difficult. Herein, the desired N–O seven-membered heterocycles were quantitatively synthesized via one-step thermo-oxidation using O2/CH3I, I2 or N-iodosuccinimide (NIS) as an oxidant. The structures of these compounds were confirmed by single-crystal X-ray diffraction. During the thermal-oxidation process, intramolecular ionization generated a flexible –CH2CH2O− group, which attacked the C=C bond with the assistance of oxidants and subsequently led to the formation of the products. The formed seven-membered heterocycles exhibited remarkably enhanced fluorescence compared to the corresponding ring-open forms of oxazolidines, which possess more flexible conjugated substructures. In particular, the fluorescence quantum yields of some products reach 0.92 and 0.62 in the red emission region. Theoretical calculations suggest that the strong fluorescence originates from their unique structural rigidity and planarity and thus highly conjugated electron system. This work provides a new synthesis method for demanding medium-sized heterocycles with notably strong fluorescence. These new dyes have potential use as visible and fluorescent dual-mode colour inks, nucleophilic reagent response materials, and bio-label materials. [ABSTRACT FROM AUTHOR]

Published
2019
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92. A framework for modeling emotion in synthetic agent

Author

Liu Yi, Wei Zhonglin, Li Jinfeng, and Hu Jiwen

Subjects
Human intelligence, ComputerApplications_MISCELLANEOUS, Affective science, Cognition, Appraisal theory, Human behavior, Psychology, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), Production system, Cognitive psychology
Abstract

Emotion is an important part of human intelligence. They can influence human behaviors and guide human to adapt to the environment. Integrating emotion into agent can enhance the authenticity and creditability of agent's behavior. This paper classifies emotion as cognitive emotion and reflex emotion. The generating mechanisms of these two emotions are analyzed. In order to model emotion in agent, a framework is proposed. In the framework, a production system is used to model cognitive emotion based on appraisal theory, and the reflex emotion is generated according to conditioned emotional response theory. At last, an experiment is given to evaluate the proposed framework.

Published
2014

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